Definitions of DSSAT variables and parameters, as taken from the different source code files and from the definition listings that existed already. Where different definitions were available, they are given both.
(May 1997, compiled by Arjan Gijsman)
** See also SOIL.CDE
A 
Zero to unity factor for relative nitrification rate. (units: ) 
A 
Logical variable to check if maximum temperature has been changed without changing minimum temperature or vice versa. (units: ) 
ACCDAY 
Ratio of proportion of development from beginning of pod addition (NPOD0) to normal end of pod addition (NDSET) completed tonight to maximum possible proportion completed (ACCSTD) (not used in PNUTGRO). (units: ) 
ACCDAY 
Fraction of physiological time completed today from NDSET (normal end of pod addition if optimum conditions) to R8 physiological maturity. Used after NDSET to reduce potential pod addition rate to zero by maturity. (units: ) 
ACCSLA 
Cumulative fraction of development from beginning bloom (R1) to day on which maximum number of Vstages occurs (NDLEAF) completed to date  vegetative partitioning is a function of this accumulator (goes from 0 to 1). (units: ) 
ACCSTD 
Maximum proportion of total development from beginning of pod addition (NPOD0) to normal end of pod addition (NDSET) which can be completed in one night if temperature is optimum and the night time accumulator is accumulating at its maximum rate (night length is above optimum (TNLG0)), (currently not used in PNUTGRO). (units: ) 
ACDATE 
Date of chemical application, operation (units: d) 
ACHAMT 
Amount of active ingredient applied. (units: ) 
ACHCOD 
Code of chemical applied. (units: ) 
ACHDEP 
Depth of incorporation, weed control op. (units: cm) 
ACHME 
Method of weed control application. (units: ) 
ACREFC 
Number of acres per hectare. (units: ) 
ACTIM 
Timing of application relative to crop. (units: ) 
ACTSW 
Extractable (available) soil water content in the fruiting zone. (units: cm^{3}/cm^{3}) 
ADDSHL 
Shell growth, intermediate variable only, mass/cohort/m^{2} (Starting with oldest) (units: g/m^{2}) 
AFLW 
Actual reduction ratio for addition of flowers for a given cohort determined from RFLWAB, photothermal accumulator (TDUMX2) and pegging zone soil water (SWADD2), latter for peanut only. (units: none) 
AG2 

AGEFAC 
Reduction in photosynthesis which is correlated to a decrease in % nitrogen in the leaves (Boote, 1976). (units: ) 
AGRLF 
Units of glucose required to produce one unit of leaf tissue. (units: ) 
AGRLF 
Carbon requirement to produce one gram of leaf tissue, without considering cost of amino acid synthesis. (units: g CH2O/g tissue) 
AGRRT 
Units of glucose required to produce one unit of root tissue. (units: ) 
AGRRT 
Carbon requirement to produce one gram of root tissue, without considering cost of amino acid synthesis. (units: g CH2O/g tissue) 
AGRSD1 
The grams CH2O required to synthesize 1g of seed and not including seed nitrogen (protein?) (units: g CH2O/g seed tissue) 
AGRSD1 
Units of glucose required to produce one unit of seed when protein must be made from scratch. (units: ) 
AGRSD2 
Units of glucose required to produce one unit of seed when protein is available through mining. (units: ) 
AGRSD2 
Carbohydrates required to make seed from nitrate. (units: g CH2O/g seed tissue) 
AGRSH 
Units of glucose required to produce one unit of shell. (units: ) 
AGRSH1 
Grams of carbohydrate required to synthesize one gram of shell tissue (Does not include nitrogen). (units: g CH2O/g tissue) 
AGRSTM 
Units of glucose required to produce one unit of stem. (units: ) 
AGRSTM 
Carbon requirement to produce one gram of stem tissue, without considering cost of amino acid synthesis. (units: g CH20/g tissue) 
AGRSTM 
Units of glucose required to produce one unit of stem. (units: ) 
AGRVG 
Carbon requirement to form one gram of vegetative tissue, without considering the cost of aminoacid synthesis. (units: g CH20/g tissue) 
AGRVG 
Units of glucose required to produce one g of dry weight of vegetative tissue. (units: g CH2O/g dry weight) 
AGRVG2 
Carbon requirement to form one gram of vegetative tissue including the cost to synthesize aminoacids (or proteins?). (units: g CH20/g tissue) 
AIRAMT 
Amount of irrigation applied, if fixed, for automatic irrigation (units: mm) 
ALBEDO 
Integrated crop and soil albedo. (units: ) 
ALPGR 
Units of glucose required to produce one unit of total plant dry weight. (units: g CH2O/g dry weight) 
ALPHA 
Gram of seed made from one gram of protein remobilized from other plant tissues. 
ALPHBR 
Weight of seed which can be made from one gram of protein, if the protein is used to supply energy and carbon skeletons as well as protein for the seed. (units: g/g) 
ALX 
Current Julian date as a radian fraction of 1 year for soil temperature caculations 
AMIR 
Irrigation depth (DEPIR) of the NAPth application. (units: cm) 
AMOUNT 
Amount to change variable in weather modification. (units: ) 
AMP 
Annual amplitude in mean monthly temperature. (units: ^{o}C) 
AMTMIN 
Irrigation applied only when the amount computed by the model (when IIRR=3) exceeds this value. (units: ) 
AMTNIT 

AMTRD 
Daily atmospheric transmission coefficient or ratio of solar to extraterrestrial ration. (units: ) 
AMTRD 
Daily atmospheric transmission from global and normal extraterrestial radiation. (units: ) 
AMTRH 
Hourly atmospheric transmission coefficient or ratio of solar/extraterrestrial ration. (units: ) 
ANH4 
Total extractable ammonium N in soil profile (units: kg N/ha) 
ANO3 
Total extractable nitrate N in soil profile (units: kg N/ha) 
ANS 
Character variable which is read from the terminal  used as a pause  program continues when carriage return or some character plus a carriage return is entered by the user. (units: ) 
ANTOP 
Maximum proportion of scheduled leaf and stem mass increase which can be shifted to roots if night length is greater than the optimum (VARN0). (units: ) 
APTOP 
Maximum proportion of scheduled leaf and stem mass increase which can be diverted from roots to shoots if solar radiation is zero (i.e. dark). (units: ) 
AREAH 
Total area of healthy (undiseased) leaf. (units: cm^{2}/m^{2}) 
AREALF 
Total leaf area. (units: cm^{2}/m^{2} ground area) 
ARG 
Exponential argument for nighttime temperature decay including B and relative time (Parton and Logan, 19??). (units: ) 
ARG 
Array of Xvalues to be used in interpolation  dimension specified in calling subroutine by variable passed as K. (units: ) 
AS 
Asin(TT), in calculation of day length. (units: ) 
ASTRES 
Average reduction in turgor (TURFAC) during a given growth phase, due to soil water deficit, 0 to 1.0. (units: ) 
ATHETA 
Average available water % in top irrigation management depth (DSOIL) m of soil. (units: ) 
ATOP 
Maximum proportion of top growth that can be partitioned into roots if severe water stress occurs. (units: none) 
ATOP 
Maximum fraction change in partitioning from top growth to roots if severe water stress occurs. (units: ) 
ATTOP 
Maximum proportion of scheduled leaf and stem mass increase which can be shifted to roots if temperature is not optimum (number of physiological days accumulated in one day (DTX) less than 1.0). (units: ) 
AVGSW 
Average soil moisture percent to depth SWPLTD. (units: ) 
AVGSW 
Average volumetric soil water in top 30 cm. (units: ) 
AVTEM 
Average temperature effect during pod development and lag seed period for each cohort of pods based on Eglis' data. Used for shell and seed number determination. (units: none) 
AVTEM 
Average temperature occurring during the early growth of each individual shell until seeds are added (LAGSD physiological days). Array is 200 for up to 200 shell cohorts. (units: ^{o}C) 
AW 
Available water used in soil temperature calculations (units: cm) 
AWR 
Assimilate area to weight ratio (units: cm^{2}/g) 
AZZON 
Solar azimuth (+/ from S). (units: deg) 
B 
Temporary variable. (units: ) 
B 
Logical variable to check if maximum temperature has been changed without changing minimum temperature or vice versa. (units: ) 
BD 
Bulk density of soil. (units: g/cm^{3}) 
BDATE 
Beginning date in weather file. (units: ) 
BETA 
Exponent in BrooksCorey equation. (units: ) 
BETA 
Solar elevation (+/ from horizontal). (units: deg) 
BETAL 
Proportion of leaf increase in dry weight which is protein available for remobilization to seeds. (units: ) 
BETAR 
Proportion of root increase in dry weight which is protein available for remobilization to seeds. (units: ) 
BETAS 
Proportion of stem increase in dry weight which is protein available for remobilization to seeds. (units: ) 
BETASH 
Proportion of shell increase in dry weight which is protein available for remobilization to seeds. (units: ) 
BETN 
Spacing between adjacent plants. (units: m) 
BPPHP 
Number of physiological days which would have been accumulated in 24 hours if the night time temperature had remained the same during whole night (between 0 and 1). (units: ) 
BPS 
Value for between plant spacing entered by the user. (units: m) 
BPTMP 
Night time temperatures corresponding to BPPHP. (units: oC) 
C 
Temporary variable. (units: ) 
C1 
Temporary constant in computation of day length. (units: ) 
C2 
Temporary constant in computation of day length. (units: ) 
CADLF 
Carbon added to leaves. (units: g/m^{2}/d) 
CADST 
Carbon added to stems, based on CADSTF. (units: g/m^{2}/d) 
CADSTF 
An input to the model that represents the proportion of carbon added to stems, assuming that it is greater than the amount of carbon added to leaves, on a per weight basis. (units: none) 
CANHT 
Canopy height. (units: m) 
CANHT 
Rate of increase in canopy height and update height. (units: ) 
CANNAA 

CANWAA 

CANWH 
Canopy width. (units: m) 
CANWH 
Rate of increase in canopy width and update width. (units: ) 
CAVTOT 
Total potential available carbohydrates based on PG availability, XFRT and carbon mined. (units: g CH2O/m^{2}/d) 
CAVTOT 
Total potential available CH2O for reproductive growth. (units: ) 
CC 
Crop code. (units: ) 
CCOS 
Temporary constant in computation of day length. (units: ) 
CDAY 
Days since planting. (units: ) 
CDMREP 
Carbon demand for reproductive growth, based on new plus mineable carbon. (units: g CH2O/m^{2}/d) 
CDMREP 
Total CH2O needed for potential reproductive growth. (units: ) 
CDMSDR 
CH2O required for this seed growth from mobilized N. (units: ) 
CDMSH 
C needed for growth. (units: ) 
CDMSH 
CH2O required for the potential shell growth. (units: ) 
CDMTOT 
Total carbon demand for vegetative and reproductive tissue growth, including respiration cost on a protein basis. (units: g CH2O/m^{2}/d) 
CDMVEG 
Carbon demand for vegetative growth based only on new photosynthate. (units: g CH2O/m^{2}/d) 
CEP 
Cumulative transpiration after germination. (units: mm) 
CES 
Cumulative evaporation after germination. (units: mm) 
CET 
Cumulative evapotranspiration after germination. (units: mm) 
CF 
Temporary variable used in leaf area reduction calculations. (units: ) 
CHANGE 
Change in the accumulators on day N since the occurence of the reference stage 
CHARTEST 
Character variable containing the contents of the last line read by the IGNORE routine. (units: ) 
CLDAM 
Cumulative leaf mass destroyed by pests. (units: g/m^{2}) 
CLEFT 
C Left to grow new nodule mass. (units: ) 
CLG 

CLOUDS 
Relative cloudiness factor (01). (units: ) 
CLOUDS 
Daily cloudiness factor (range: 01). (units: ) 
CLSEN 
Cumulative leaf mass senesced. (units: g/m^{2}) 
CLSEN 
Cumulative senesence. (units: ) 
CLTV 
Cultivar code. (units: ) 
CMINEP 
Amount of carbon mined from plant carbohydrate pool. (units: g CH2O/m^{2}/d) 
CMINEP 
The amount that is mined from the plant carbohydrate pool. (units: g CH2O/m^{2}) 
CN1 
Intermediate quantity used to calculate daily runoff. (units: ) 
CN2 
Soil conservation service runoff curve number used to calculate daily runoff. (units: ) 
CNIT1 
Yintercept of the equation relating reduction in gross photosynthate (PG) to average canopy nitrogen content. (units: ) 
CNIT2 
Linear coefficient of the equation relating reduction in gross photosynthate (PG) to average canopy nitrogen content. (units: ) 
CNIT3 
Quadratic coefficient of the equation relating reduction in gross photosynthate (PG) to average canopy nitrogen content. (units: ) 
CNMINE 
Amount of carbohydrate required to mine for protein. (units: g CH20/m^{2}/d). (units: ) 
CNMOB 
Fraction of available vegetative protein pool which is mobilized per physiological day for variety I. (units: ) 
CNOD 
Compute C used in Nfixation and nodule growth (including respiration costs) 
CNODCR 
C requirement for nodule respiration (units: g C/g nodule/d) 
CNODMN 
Minimum C reserved for nodule growth left after N fixation. (units: ) 
CNOFIX 
Compute C used for Nfixation. (units: ) 
CNOLD 
Amount of carbohydrate left over after taking into account the requirement for vegetative and reproductive growth (to see if it can be used to reduce nitrogen). (units: g CH2O/m^{2}/d) 
CO2 
Carbon dioxide concentration of air. (units: ul/l) 
CO2ADJ 
Carbon dioxide adjustment amount. (units: ul/l) 
CO2BAS 
Carbon dioxide base level from which adjustments are made. (units: ul/l) 
CO2FAC 
Carbon dioxide adjustment factor (Addition, Subtraction, Multiplication, Replacement). (units: ) 
CONGR1 
Proportion of the total difference between maximum allowable leaf mass per unit leaf area (SLW) and current SLW which the canopy can add in one day (0.3), (currently not used in PNUTGRO). (units: ) 
CONSD1 
Yintercept of the quadratic equation relating reduction in the maximum seed and shell growth rates to daily average temperature. (units: ) 
CONSD2 
Linear coefficient of the quadratic equation relating reduction in the maximum seed and shell growth rates to daily average temperature. (units: ) 
CONSD3 
Quadratic coefficient of the equation relating reduction in the maximum seed and shell growth rates to daily average temperature. (units: ) 
CONST 
Constant used in halfwave computation of hourly radiation. (units: rad/s * J/MJ) 
CORR 
Correction to decrease diffuse radiation by the circumsolar component, since circumsolar diffuse radiation acts like direct radiation (Spitters, 1986). (units: ) 
COS90B 
Cosine function used in the calculation of circumsolar radiation (Spitters, 1986). (units: ) 
COSB 
Cosine function used in the calculation of circumsolar radiation (Spitters, 1986). (units: ) 
CP 
Coupling point name. (units: ) 
CRAIN 
Cumulative precipitation after germination. (units: mm) 
CRLF 
Cumulative root length flux. (units: ) 
CRLV 
Cumulative root length density. (units: ). 
CRTM 
Cumulative root length mass. (units: ) 
CRUSLF 
Carbon mined out of leaves to use for growth. (units: g CH2O/m^{2}/d) 
CRUSRT 
Carbon mined out of roots to use for growth. (units: g CH2O/m^{2}/d) 
CRUSSH 
Carbon mined out of shells to use for growth. (units: g CH2O/m^{2}/d) 
CRUSST 
Carbon mined out of stems to use for growth. (units: g CH2O/m^{2}/d) 
CSDC 
Cosine of the solar declination, used in day length calculation. (units: ) 
CSLT 
Cosine of the latitude, used in day length calculation. (units: ) 
CUMDEP 
Cumulative depth of the soil profile. (units: cm) 
CUMRAT 

CUMSW 
Cumulative soil moisture. (units: ) 
CUMTUR 
Cumulative turgor factor that remembers veg drought stress to shift partitioning between leaf and stem toward leaf, especially after drought is released. (units: ) 
D 
Local variable to indicate % available water triggering irrigation. (units: ) 
DAMSD 
Number of seeds which have been damaged by a podfeeding insect so that they are no longer growing  zero when only defoliating insects are included, (currently not used in PNUTGRO). (units: ) 
DAP 
Days after planting (units: d) 
DASH 
Local variable to read  symbol. (units: ) 
DATE 
Date of operation, year & day of year. (units: ) 
DAYADJ 
Day length adjustment amount. (units: d) 
DAYFAC 
Day length adjustment factor (Addition, Subtraction, Multiplication, Replacement). (units: ) 
DAYL 
Day length on day of simulation (sunrise to sunset). (units: h) 
DBAR 
Average soil water diffusivity used to calculate upward water flow in top layers. 
DD 
Soil temperature damping depth (units: mm) 
DDLL1 
Array containing depth of upper surface of soil layers. (units: ) 
DDLL2 
Array containing depth of lower surface of soil layers. (units: ) 
DEC 
Solar declination or (90solar elevation at noon). Amplitude= +/23.45. Minimum=Dec 21, maximum Jun 21/22. (units: deg) 
DECL 
Declination of sun. (units: ) 
DEP 
The depth of a particular layer of soil which has roots in it at emergence (NVEG0). (units: cm) 
DEPIR 
Depth of irrigation (units: cm) 
DEPMAX 
Maximum soil depth where soil water content changes. (units: mm) 
DEPTH 
Depth to the bottom of a layer from the surface (units: cm) 
DETVEG 
A switch which allows either indeterminate (0) or determinate (1) leaf area expansion. (units: none) 
DHVAR 
Physiological days for floral induction if night length is above optimum (TNLG0). (units: ) 
DIGITS 

DISLA 
Leaf area which is diseased (currently not used in PNUTGRO). (units: m^{2}/m^{2}) 
DISPER 
Percent of leaf area which is diseased (currently not used in PNUTGRO). (units: ) 
DL1 
Upper depth of a soil layer. (units: cm) 
DL2 
Lower depth of a soil layer. (units: cm) 
DLAYR 
Depth of root layer. (units: cm) 
DLAYR 
Depth increment of soil layer L. (units: cm) 
DLAYR(L) 
values are depths to the bottom of layer L. (units: ) 
dLdT 
Daily net change in leaf mass. (units: g/m^{2}/d) 
DLFWT 

DMOD 
Zero to unity factor which reduces the rate constant for mineralization of the humus pool for soils which are poor mineralizers due to chemical or physical protection of the organic matter (default=1). (units: ) 
DNIT 
Number of nights required to accumulate one unit of the night time accumulator at the prevailing night length if temperature is optimum. (units: ) 
DOY 
Day of year (units: d) 
DPTFAC 
Dew point adjustment factor (Addition, Subtraction, Multiplication, Replacement). 
DRAIN 
Drainage of water through the bottom of the root zone for a precipitation event. (units: cm) 
DRN 

DRPP 
Rate of photoperiodic progress from GPHEN. Used in pod set. (units: daylength rate) 
DS(L) 
Values are depths to the bottom. (units: ) 
DSFILE 
Flag indicating whether initial soil water content is read from a file (DSFILE=1 ) or is assumed equal to the field capacity (DSFILE=1 ). Drainage of water through each layer of soil. (units: ) 
DSHL 
Dry weight added to shells of a given age on day N. (units: g/m^{2}/d) 
DSINB 
Integral of solar elevation over day (Spitters, 1986). (units: s) 
DSINB 
Integral of SINB over day (units: s) 
DSOIL 
Irrigation management depth. (units: m) 
DSOILN 

dSTdT 
Daily change in stem mass. (units: g/m^{2}/d) 
DSTEM 
Desired stem mass. (units: g/m^{2}/d) 
DSTRES 
Counter for cumulative days during a given growth phase, used to compute average reduction in turgor or photosynthesis. (units: d) 
DSW 
Incrementing soil depth for successive soil layers to calculate actual depth (DSWBAR) which affects fruiting. (units: cm) 
DSWBAR 
Depth of upper soil layers in which soil water deficit is allowed to directly reduce rate of pegging (pod addition). (units: cm) 
DT 
Difference between moving average soil surface temperature and longterm daily average ambient temperature. (units: ) 
DTC 
Pod detachment thermal time counter. (units: ) 
DTN 

DTT 
Number of degree days accumulated in one day (currently not used in PNUTGRO). (units: ) 
DTX 
Number of physiological days accumulated in one day. (units: ) 
DUL 
Drained upper limit soil water content for soil layers. (units: cm^{3}/cm^{3}) 
DUMFAC 
Ratio of variety specific SLA during vegetative growth to that for standard cultivar. (units: ) 
DUMMY 
Xvalue for which a Yvalue is to be found by interpolation. (units: g/m^{2}/d) 
DURNIT 
Night length. (units: h) 
DWFILE 
Temporary weather file name. (units: ) 
DWLPOS 
Increase in leaf weight as a function of gross photosynthate (PG)  does not include leaf weight lost due to senescence. (units: g/m^{2}/d) 
DWPMAX 
Maximum growth rate of all seeds present number of growing seeds times temperature dependent growth rate per seed. (units: ) 
DWPOS 
Increase in dry weight of crop per day (not including senescence). (units: g/m^{2}/d) 
DX 
Number of days for which protein may be mined from leaves, stems, and shells at the maximum rate before protein pools are depleted (currently not used in PNUTGRO). (units: ) 
DYNAMICS 
Switch to determine process calculations. (units: ) 
EDATE 
Ending date in weather file. (units: cm^{2}/g) 
EEQ 
Equilibrium evapotranspiration used to calculate potential evapotransporation. (units: mm/d) 
EFF 
Decoded value of irrigation application efficiency returned by subroutine VERIFY. (units: cm/cm) 
EFFIRR 
Application efficiency of irrigation water. (units: cm/cm) 
EFINOC 
Inoculation effectiveness (or rhizobium density factor). (units: ) 
EFNFIX 
Strain efficiency (potential growth of nodules). (units: ) 
EGFT 

ELEV 
Site elevation above mean sea level. (units: m) 
EO 
Potential evapotranspiration. (units: mm/d) 
EOS 
Potential soil evaporation. (units: mm/d) 
EP 
Actual plant transpiration. (units: mm/d) 
EP1 
Actual transpiration. (units: cm/d) 
ERRKEY 
Key string for locating correct error message in ERROR.DAT. (units: ) 
ERRNUM 
Error number in ERROR.DAT under key string. (units: ) 
ES 
Actual soil evaporation. (units: mm/d) 
ES1 
Actual soil evaporation. (units: cm/d) 
ESC 
Clearing screen. (units: ) 
ESW 
Extractable soil water content for soil layer I (the difference between drained upper limit (DUL) and lower limit (LL) soil water content. (units: cm^{3}/cm^{3}) 
ESX 
Temporary soil evaporation variable. (units: mm/d) 
ET 
Actual soil and plant evaporation. (units: mm/d) 
EXLFW 

EXPTNO 
Ratio of leaf area to leaf weight for leaf tissue which is added on a given day. 
F 
Specific leaf area for new leaf growth. (units: cm/g leaf tissue) 
FAC 

FACLIT 
Leaf area index at which 63 % of the light is intercepted for the given plant spacing. (units: ) 
FDEPTH 
Fertilizer depth (units: cm) 
FFVEG 
Specific leaf area (SLA) of new leaves during vegetative growth, after considering the effects of cultivar, temperature, solar radiation, and soil water deficit, based on FVEG. (units: cm^{2}/g) 
FILEW 
Internal weather file name. (units: ) 
FINIT 
Specific leaf area (SLA) of leaves when plants emerge  variety specific. (units: cm^{2}/g) 
FINREF 
Specific leaf area (SLA) of leaves of standard peanut cultivar (Florunner) when plants emerge  values for other cultivars are calculated in subroutine VARTY. (units: cm^{2}/g) 
FLADD 
The number of flowers that are developed and available to form pods. Calculated from the variables FLWRDY, TEMPOD, DRPP, SWADD, XFRUIT. (Note: with code rewrite, we can delete this variable and use only FLWRDY, KJB). (units: m^{2}) 
FLAG 

FLAYR 
Fraction of next lower soil layer to include in depth of soil in which available soil water is allowed to directly affect rate of pegging (DSWBAR). (units: ) 
FLDACT 
Soil water flooding effect on N2 fixation and nodule growth. (units: ) 
FLG 

FLNO 
The total number of flowers actually added per meter square. (units: m^{2}) 
FLOW 
The amount of soil water flowing upwards near the soil surface. (units: cm/d) 
FLWADD 
Actual addition of flowers today, depends on the potential rate of flowering. (FLWMAX), today's photosynthesis relative to optimum rate (PMAX is the ratio), temperature (TEMPOD), rate of photoperiodic progress (DRPP), soil water status (SWADD) (*error here. SWADD for old PNUTGRO only which does not add flowers, but adds pegs), and XFRUIT. (units: m^{2}) 
FLWFRC 
A 0.0 to 1.0 function used to determine the number of flowers that will be available to be converted to pods on a given day. (units: none) 
FLWMAX 
Potential rate of flowering for a canopy at maximum canopy photosynthesis and if temperature and photoperiod are optimum. Based on input FLWVAR for each genotype. (units: #/m^{2}) 
FLWN 
The flower number added for cohort J. (units: #/m^{2}) 
FLWRDY 
The number of flowers that survive NPOD0 photothermal days of all cohorts which can limit pod addition or may be in excess of PODVAR. Filtered through FLADD prior to limiting pod addition. (units: none) 
FNINL 
Initial fraction of nitrogen in the leaf, a maximum amount. (units: none) 
FNINLG 
Minimum concentration of nitrogen in the leaf which allows growth at maximum (normal) rate. (units: none) 
FNINR 
Initial fraction of nitrogen in roots, a maximum amount. (units: none) 
FNINRG 
Minimum concentration of nitrogen in root organ which allows growth at maximum (normal) rate. (units: none) 
FNINS 
Initial fraction of nitrogen in stems, a maximum amount. (units: none) 
FNINSD 
The fraction nitrogen of seed (Genetic input). (units: %, none? ) 
FNINSG 
Minimum concentration of nitrogen in the stem which allows growth at maximum (normal) rate. (units: none) 
FNINSH 
The fraction nitrogen of shell (parameter file) (units: %, none? ) 
FNINSH 
Initial fraction of nitrogen in the shell, a maximum amount. (units: none) 
FOUND 
Return code from input routines. (units: ) 
FRACDN 
Fraction of development from beginning bloom (R1) to day on which maximum number of Vstages occur (NDLEAF0 which is completed in a given day). (units: ) 
FRACDN 
Relative time from flowering to last leaf. (units: ) 
FRDFD 
Daily fraction diffuse radiation. Used in the calculation of cloudiness factor (Spitters, 1986). (units: ) 
FRDFH 
Hourly fraction diffuse radiation before correcting for circumsolar radiation (Spitters, 1986). (units: ) 
FRDIFP 
Hourly fraction diffuse photon flux density after correcting for circumsolar radiation (Spitters, 1986). (units: ) 
FRDIFR 
Hourly fraction diffuse solar radiation after correcting for circumsolar radiation (Spitters, 1986). (units: ) 
FREEZ1 
Temperature below which plant is damaged by freezing, leaves are killed. 
FREEZ2 
Temperature below which all growth stops, plants are killed. (units: ) 
FREP 
Specific leaf area (SLA) of new leaf weight as growth proceeds during reproductive stages. (units: cm^{2}/g) 
FREQ 
Decoded value of output frequency. (units: ) 
FRLF 
Fraction of total daily increase in growth which will be partitioned to leaves during the current day, as a function of Vstage. (units: none) 
FRLFF 
Final fraction of daily increase in growth which will be partitioned to leaves after NDLEAF occurs, if there is any carbon left over. (units: none) 
FRLFF 
Fraction of daily increase in vegetative weight which goes to leaves after the day on which the maximum number of Vstages occurs (NDLEAF). (units: ) 
FRLFM 
Fraction of daily increase in growth which will be partitioned to leaves during reproductive growth (between flowering and maturity). (units: none) 
FRLFM 
Fraction of daily dry weight increase going to leaves at beginning bloom (R1). (units: ) 
FRRT 
Fraction of total daily increase in growth which will be partitioned to roots during the current day, as a function of Vstage. (units: none) 
FRSTM 
Fraction of total daily increase in vegetative weight which will be partitioned to stems during the current day, as a function of Vstage. (units: none) 
FRSTMF 
Final fraction of daily increase in vegetative weight which will be partitioned to stems after the day on which the maximum number of Vstages occurs (NDLEAF), if there is any carbon left over. (units: none) 
FRSTMM 
Fraction of daily dry weight increase going to stems at beginning bloom (R1). (units: ) 
FSM 
Feeding sight mass or number (amount). (units: ) 
FSTR 

FTYPEN 

FVEG 
Maximum specific leaf area (SLA) of new leaf weight for a given cultivar during vegetative growth, when grown at optimum temperature, optimum water, and near zero solar radiation. (units: cm^{2}/g) 
GAINMN 
The calculated maximum gain in leaf weight from the photosynthate available on day N  photosynthate is reduced if there is insufficient leaf area present to absorb all the weight gain (used prior to Vstage beyond which sinklimited leaf area expansion no longer limits photosynthesis or leaf area growth (VSSINK) to limit leaf growth). (units: ) 
GAINNW 
Leaf area added on day N (used prior to Vstage VSSINK). (units: cm^{2}/m^{2} ground area) 
GAINWT 
Leaf weight added on day N (used prior to Vstage beyond which sinklimited leaf area expansion no longer limits photosynthesis or leaf area growth (VSSINK) and after the day when the maximum number of Vstages occurs (NDLEAF)). (units: g/m^{2}) 
GAMMAL 
Concentration of remobilizable protein in leaves that senesce early due to water stress. (units: ) 
GAMMAR 
Concentration of remobilizable protein in roots that senesce. (units: physiological d; presently still integer) 
GAMMAS 
Concentration of remobilizable protein in petioles that senesce early due to water stress. (units: day of year) 
GAMMSH 
Concentration of remobilizable protein in shells that senesce early due to abortion. (units: day of year) 
GAREA 
?? (units: cm^{2}/m^{2}) 
GDMSD 
Potential seed growth for day. Calculated in subroutine DEMAND. (units: g tissue/m^{2}/d) 
GDMSD 
Total CH2O demand to grow (units: g tissue) 
GDMSDR 
Potential seed growth which is possible with the amount of N in NDMSDR 
GDMSH 
Growth demand for shells. (units: ) 
GGG 

GRF 

GROEAR 
Daily growth of the ear (units: g) 
GROGRN 
Daily growth of the grain (units: g) 
GROMAX 
Maximum leaf area which can be added per plant between emergence and day of simulation as a function of Vstage on day of simulation. (units: cm^{2}/plant) 
GROPAN 
Daily growth of the pannicle (units: g) 
GRORT 
New weight of roots on a per plant basis. (units: g/plant/d) 
GROSUB 
Subroutine that estimates the potential new growth 
GROWTH 
Increase in dry weight of crop which is due to gross photosynthate (PG), not including senescence. (units: g/m^{2}/d) 
GROYES 
Maximum leaf area which could have been added per plant between emergence and yesterday as a function of Vstage on day N1. (units: cm^{2}/plant) 
GRRAT1 
Potential growth rate per shell under the current temperature and photoperiod. (units: g/d) 
GRRAT1 
Maximum growth rate per shell as a function of temperature. (units: g/m^{2}/d) 
H 
Internal hourly counter. (units: h) 
HANGL 
Hour angle or hourly time step as a proportion of day (+/PI). (units: rad) 
HAREND 
Computed harvest date. (units: ) 
HDATE 
Specified day after planting for harvesting. (units: ) 
HDECAY 
Time for hourly temperature exponential decay, from sunset to sunrise+C. (units: h) 
HDLAY 
Earliest day after harvest maturity (R8). (units: ) 
HDRFMT 
Weather file header format (first line). (units: ) 
HEARLY 
Computed from HDLAY; sets first day of harvest window. (units: ) 
HI 
Pod harvest index, pod as a fraction of shoot mass, 0 to 1.0. (units: day of year) 
HLATE 
Latest day of the year to harvest; last day of window. (units: ) 
HLIGHT 
Hours of daylight from sunrise to sunset. (units: h) 
HOLD 
Temporary variable for interchanging values. (units: ) 
HOLD 
The amount of water a soil layer will hold above its present level, used to calculate downward flow. (units: cm) 
HPAR 
Effect of day's PAR on canopy expansion. (units: ) 
HS 
Inte rnal hourly counter. (units: h) 
HST 
Specified growth stage for harvesting. (units: ) 
HSTG 
Specified growth stage for harvesting. (units: ) 
HWDL 
Effect of daylength on length of internodes (not used at present). (units: none) 
HWPAR 
Effect of light on the length of each internode. (units: none) 
HWTEM 
Effect of temperature on the length of each internode. (units: none) 
HWTEM 
Effect of temperature on canopy expansion. (units: ) 
HWTUR 
Effect of water stress on the length of each internode. (units: none) 
I 
Loop counter. (units: none) 
I 
Convert stem weight to integer. (units: ) 
IAGE 
Days after planting, where IAGE=0 on the day of planting. (units: ) 
ICOLD 

IDRSW 
An integer containing information about downward flowing soil water: 0=no downward flow, 1=downward flow. (units: ) 
IDUMM 
Julian date corresponding to a planting date entered by the user from the terminal  if it lies between proper limits IPLT is reset to planting date (IDUMM). (units: ) 
IDUMSL 
Integer which indicates soil type which is read from soil data file along with soil parameters. (units: ) 
IDY 
Day of month of userspecified calendar date of planting. (units: ) 
IDYS 
Day of month of userspecified calendar date of planting. (units: ) 
IDYY 
Day of month for planting date specified by user from terminal. 
IFERI 

IFFS 
Field observed date of first full sized seed (R6). (units: ) 
IFFSC 
Model computed date of first full sized seed. (units: ) 
IFLAG 
Flag for N source (1=urea; 2=NO3). (units: ) 
IOFF 

IPLTI 
Switch for automatic planting, A=automatic. (units: ) 
ISECT 
Indicator of completion of IGNORE (0=End of file encountered; 1=Found a good line to read; 2=End of section in file encountered, denoted by * in column 1. (units: ) 
ISFLAG 

ISWNIT 
Nitrogen simulation switch. (units: ) 
J 
Loop counter. (units: none) 
JCOUNT 

JULD 

K 
Number of soil water potential value. (units: ) 
K 
Layer and loop counter. (units: none) 
KPFLG 

L 
Loop counter. (units: none) 
L 
Layer number. (units: none) 
LAGSD 
Genetic input for length of time from pod initiation and seed growth, for each cohort. (units: photothermal d) 
LAGSD 
Number of days between start of peg (full flower) and shell formation. Only used in peanut to define slow growth period. (units: ) 
LAI 
Crop leaf area index on current day. (units: ) 
LAIW 
Weed leaf area. (units: m^{2}/m^{2}) 
LL 
Lower limit (15 atm.) soil water content (units: cm^{3}/cm^{3}) 
LNGPEG 
Photothermal days that shells are in their slow (lag) growth phase after pod initiation, for each cohort. The early part of LNGSH. Check (KJB). (units: photothermal d) 
LNGPEG 
Minimum days from start of flowering to last leaf appearance. (units: ) 
LNGSH 
Photothermal days that shells grow (gain weight) after pod initiation, for each cohort. Timing not necessarily tied to LAGSD. (units: photothermal d) 
LTOT 
Total cumulative leaf mass produced. It is used as a reference for defining defoliation. (units: g/m^{2}) 
LUNIO 
Logical unit no. for input File X. (units: ) 
MNEMV1 
Minimum days for phenological events under optimum conditions (temperature and short photoperiod). (units: ) 
MNESPM 
Number of days between start of shell and seed formation of a pod. (units: ) 
MNFLHM 
Number of days from end pod set to physiological maturity. (units: ) 
MNFLLL 
Minimum days from emergence to vegetative growth stage 1. (units: ) 
MON 

N 
Day counter  begins on day user wishes to start keeping track of soil water content (day of simulation). (units: ) 
N 
The number of days after sowing. (units: none) 
NADLF 
Nitrogen added to the leaves. (units: g N/m^{2}/d) 
NADRAT 
Nitrogen addition rate. (units: ) 
NADRT 
Nitrogen added to the roots. (units: g N/m^{2}/d) 
NADST 
Nitrogen added to the stems. (units: g N/m^{2}/d) 
NAGE 
The number of calendar days since shell cohort J has been initiated. (units: d) 
NAP 
Number of irrigation applications. (units: none ) 
NAPNIT 

NAVL 
Nitrogen available for seed growth. (units: g N/m^{2}) 
NAVL 
Nitrogen available for growth. (units: g N/m^{2}/d) 
NAVPOD 
Nitrogen available for shell growth, after seeds have grown. (units: g N/m^{2}) 
NDAY 

NDEF1 
N defficiency index: the effect of N deficiency on the rate of photosynthesis per unit leaf area. 
NDEF2 
N defficiency index: the effect of N deficiency on the rate of leaf expansion and leaf senescence 
NDEF3 
N defficiency index: the effect of N deficiency on tillering 
NDEF4 
N defficiency index: the effect of N deficiency on the rate of grain N accumulation 
NDIF 

NDLEAF 
Day of simulation which identifies the end of leaf growth. (units: ) 
NDMNEW 
Nitrogen demand for new tissue (vegetative plus reproductive). (units: g N/m^{2}/d) 
NDMOLD 
Potential nitrogen demand of old vegetative tissue, based on a maximum amount (FNINL, FNINR, FNINS) that can be replenished. (units: g N/m^{2}/d) 
NDMREP 
Nitrogen demand for reproductive growth, seeds plus shells. (units: g N/m^{2}/d) 
NDMSD 
N required for seed. (units: ) 
NDMSDR 
Calculate amount of mobilized N which can be used for seed growth 
NDMSH 
N needed for growth (units: ) 
NDMTOT 
Total nitrogen demand for reproductive, vegetative, new and old tissue. (units: g N/m^{2}/d) 
NDMVEG 
Nitrogen demand for vegetative growth. (units: g N/m^{2}/d) 
NDSET 
Last day that flowers can be set. Determined in GPHEN??? May not be needed (KJB) (units: day #) 
NDTH 
Nodule death rate. (units: ) 
NFAC 
N factor: effect of N availability on plant growth (range 01) 
NFIXN 
Amount of nitrogen fixed. (units: g N/m^{2}/d) 
NFXAGE 
Average nodule age effect on nodule growth. (units: ) 
NGRLF 
Maximum amount of nitrogen required for new leaf growth based on FNINL (maximum concentration of nitrogen in leaves). (units: g N/m^{2}/d) 
NGRLFG 
Minimum amount of nitrogen required for new leaf growth based on FNINLG (minimum concentration of nitrogen in leaves). (units: g N/m^{2}/d) 
NGRRT 
Maximum amount of nitrogen required for new root growth based on FNINR (maximum concentration of nitrogen in roots). (units: g N/m^{2}/d) 
NGRRTG 
Minimum amount of nitrogen required for new root growth based on FNINRG (minimum concentration of nitrogen in roots). (units: g N/m^{2}/d) 
NGRSD 
The total nitrogen required to grow the new tissue for all seeds. (units: g N/m^{2}/d) 
NGRSH 
The total nitrogen required to grow the new tissue for all shells. (units: g N/m^{2}/d) 
NGRST 
Maximum amount of nitrogen required for new stem growth based on FNINS (maximum concentration of nitrogen in stems). (units: g N/m^{2}/d) 
NGRSTG 
Minimum amount of nitrogen required for new stem growth based on FNINSG (minimum cooncentration of nitrogen in stems). (units: g N/m^{2}/d) 
NGRVEG 
Maximum amount of nitrogen required for new vegetative tissue growth. (units: g N/m^{2}/d) 
NGRVGG 
Minimum amount of nitrogen required for new vegetative tissue growth (G terms). (units: g N/m^{2}/d) 
NHWDL 
Number of paired values in array describing daylength effect on length of internodes. (Not used at present). (units: none) 
NHWPAR 
Number of paired values in array describing the effect of PAR on the length of internodes. (units: none) 
NHWTEM 
Number of paired values in array describing temperature effect on the length of internodes. (units: none) 
NHWTUR 
Number of paired values in array describing the effect of water stress on the length of internodes. (units: none) 
NLAYR 
Number of soil layers. (units: none) 
NLEFT 
The nitrogen left after seed growth and shell growth. (units: g N/m^{2}/d) 
NLEFT 
Nitrogen left over after new growth has been subtracted. (units: g N/m^{2}/d) 
NMINEA 
Total nitrogen mined from tissue. (units: g N/m^{2}/d) 
NMINEP 
Potential nitrogen mining. (units: g N/m^{2}/d) 
NMINER 
Nitrogen mining rate. (units: ) 
NMOBMX 
Maximum fraction of N that can be mobilized per day. (units: ) 
NMOBR 
Nitrogen mobilization rate. (units: ) 
NMOBR 
Stagedependent mining rate. (units: ) 
NODGR 
Nodule growth. (units: g/m^{2}/d) 
NOUTDO 
File handle. (units: none) 
NPEST 
Number of pests in the pest parameter file. (units: none) 
NPLTD 
Number of whole plants destroyed. (units: #/m^{2}/d) 
NPODO 
The number of days after sowing for first pod. Determined in GPHEN. (units: d) 
NPOOL 
Total amount of N available in the plant for translocation(units: g/plant) 
NPOOL1 
N in plant shoot that is available for translocation (units: g/plant) 
NPOOL2 
N in plant roots that is available for translocation(units: g/plant) 
NPP 
Cohort number (used in doloops). (units: none) 
NR1 
The first day of flowering determined in subroutine GPHEN. (units: none) 
NR1 
Day of simulation when there is at least one open flower at any node on the plant (R1). (units: ) 
NRATIO 
Ratio by which the growth of tissue is restricted due to nitrogen limitation. (units: none) 
NRUSLF 
Nitrogen mined from the leaves. (units: g N/m^{2}/d) 
NRUSRT 
Nitrogen mined from the roots. (units: g N/m^{2}/d) 
NRUSSH 
??? Nitrogen that can be mined from shells. (units: ) 
NRUSSH 
Nitrogen mined from the shells. (units: g N/m^{2}/d) 
NRUSST 
Nitrogen mined from stems. (units: g N/m^{2}/d) 
NSDDL 
Number of large seed destroyed. (units: #/m^{2}/d) 
NSDDM 
Number of mature seed destroyed. (units: #/m^{2}/d) 
NSDDS 
Number of small seed destroyed. (units: #/m^{2}/d) 
NSDR 
Plant N supply/demand ratio used to modify grain N content 
NSHDL 
Number of large shells destroyed. (units: %/d) 
NSHDM 
Number of mature shells destroyed. (units: #/m^{2}/d) 
NSHDS 
Number of small shells destroyed. (units: #/m^{2}/d) 
NSINK 
Demand for N associated with grain filling (units: g/plant/d) 
NSINKM 

NSINKT 

NSLATM 
Number of paired values in array which describe the effect of temperature on specific leaf area. (units: none) 
NSTRES 
Nitrogen stress term, based on supply and demand. (units: none) 
NSUM 

NSWFAC 
The number of data points in the look up function for determining SWADD. (units: none) 
NUF 
N uptake factor: N demand divided by potential N uptake (range 01) 
NUP 
Upward movement of nitrate in a soil layer 
NVEGO 
Day of plant emergence (units: d) 
NVSHT 
Number of paired values in array which describe normal height as a function of Vstage (without any kind of stress.) (units: none) 
NVSMOB 
Relative N mobilization rate in vegetative stage, relative to reproductive stage. (units: ) 
NVSPT 

NVSWH 
Number of paired values in array describing normal width as a function of Vstage (without any kind of stress). (units: none) 
NWDC 
Number of weed control operations performed. (units: none) 
NXFTEM 
Number of paired values in array describing temperature effect on partitioning to fruits (XFRUIT). (units: ) 
NYRCHK 

OPME 
Method code. (units: ) 
OPOP 
Management option (from management subsection SIMULATION CONTROL). (units: ) 
OPTY 
Operation type. (units: ) 
OUTN 
Nitrate N leaching from a layer (units: kg N/ha) 
PAGE 
The calculated photothermal days (PHTIM) of shell or seed cohort J. (units: photothermal d) 
PAGE 
Physiological age of cohort 
PANDW 

PAR 
Daily photosynthetically active radiation or photon flux density, calculated as half the solar radiation (units: MJ/m^{2}). (units: ) 
PARSLA 
Relative effect (0 to 1.0) of daily photosynthetically active radiation on specific leaf area (SLA) of new leaves. (units: none) 
PC 

PCARB 
(potential?) Daily amount of carbon fixed (units: g) 
PCLMA 
Percent of actual leaf mass (WTLF) destoryed. (units: %) 
PCLMT 
Percent of total leaf mass (WTLF+senesence) destroyed. (units: % ) 
PCNL 
Current percentage of nitrogen in the leaves. (units: %) 
PCNRT 
Current percentage of nitrogen in roots. (units: %) 
PCNSH 
Current percentage of nitrogen in shell. (units: %) 
PCNST 
Current percentage of nitrogen in stems. (units: %) 
PCO2 
Photosynthetic response to CO2. (units: ) 
PCPID 
Pest coupling point identification code. (units: ) 
PCSTMD 
Desired cumulative percent stem mass destroyed. (units: % ) 
PCTID 
Pest curve type identification code. (units: ) 
PCTMAT 
The fraction of pods that are mature (seed are 90% of final size), used for PNUTGRO. (units: none) 
PDCF1 
Pest damage coefficient for pest curve. (units: ) 
PDLA 
Percent diseased leaf area. (units: %) 
PDLA 
Diseased leaf area (see also TDLA). (units: ) 
PDW1 
Potential growth of plant tops 
PGAVL 
The available carbohydrate for plant growth. (units: g CH2O/m^{2}/d) 
PGAVLR 
The available carbohydrate for reproductive growth (Used for peanuts), works for bean and soybean if XFRT = 1.0. (units: g CH2O/m^{2}/d) 
PGLEFT 
The carbohydrate left after seed and shell growth. (units: g CH2O/m^{2}) 
PGLEFT 
Amount of gross photosynthate (PG) left to be used in synthesis of remaining plant tissues. (units: g CH2O/m^{2}/d) 
PGNPOD 
Carbohydrate available for pod growth, after seed growth. (units: g CH2O/m^{2}) 
PGRORT 
Potential root growth 
PHTHRS 
From parameter file that determines the period that allows flower in the cohort to make pods. (units: photothermal d) 
PHTIM 
Stores the cumulative photothermal time ages of seeds and shells. (units: none) 
PID 
Pest identification header. (units: ) 
PL 
Pest level from pest progress file. (units: ) 
PLAGMS 

PLAGT 

PLAIW 
Percent weed leaf area, laiw/(laiw+lai crop). (units: %) 
PLALR 

PLAS 
The rate of senescence of leaf area on one plant (units: cm^{2}/d) 
PLATN 

PLFAD 
Percent leaf area damaged. (units: %/d) 
PLFMD 
Percent leaf mass destroyed. (units: %/d) 
PLTPOP 
Number of plants per meter square. (units: ) 
PMAX 
Ratio set in PHOTO subroutine, that expresses today's photosynthesis rate as a ratio of the maximum photosynthetic rate if under optimal canopy size, temperature, light and photosynthesis conditions. (units: none) 
PNTIM 
Stores the cumulative photothermal days (PTD) for flowers. (units: none) 
PODADD 
Actual number of pods that can be added to crop on day J. Calculated from the variables PODVAR, PMAX, TEMPOD, DRPP, SWADD, and XFRUIT, which set genetic, photosynthetic, temperature, photoperiod, soil water, and partitioning limits, respectively. (units: #/m^{2}) 
PODMAT 
The number of mature pods, in which pod cavities are filled . Summed over individual cohorts if weight per seed exceeds 90% of SDMAXX (maximum possible size of seed). For PNUTGRO. (units: g/m^{2}) 
PODNO 
Total number of all pods per meter square. Goes to output. (units: m^{2}) 
PODSUM 
The total weight of the pods and seeds. Goes to output. (units: g/m^{2}) 
PODVAR 
The potential rate of pod addition for a given cultivar at maximum photosynthesis and optimum temperature, photoperiod, and soil water conditions. A genetic input. (units: #/m^{2}/d) 
PODWT 
Weight of pods. (units: g/m^{2}) 
PORMIN 
Minimum pore space required for supplying oxygen to roots for optimal growth and function. (units: ) 
PP3 

PPLTD 
Percent of whole plants destroyed. (units: %/m^{2}/d) 
PPSR 
Percent photosynthesis reduction. (units: %) 
PRECIP 
Precipitation for the current day (units: mm) 
PRFT 
Photosynthetic reduction factor for temperatures below 20 or above 40 ^{o}C. (units: ) 
PROF 
Proportion of soil destined fertilizer. (units: ) 
PROLFF 
Proportion of proteins in leaves at the end of the season, after all possible nitrogen has been translocated to seeds. (units: none) 
PROLFG 
Protein content of the leaves at the lowest level that growth can continue without any kind of stress. (units: none) 
PROLFI 
Initial proportion of protein in new leaf tissue, at luxury level growth. (units: none) 
PROLFT 
Amount of protein which can be remobilized from leaves, stems, and shells today for which there is no CH2O available to make seed at a respiratory cost of AGRSD2 (glucose recquired to produce one unit of seed when protein is available through mining)  this can be used for energy, carbon skeletons, and protein at the rate of 0.68 g seed/g protein. (units: g/m^{2}/d) 
PRORTG 
Protein content of the leaves at the lowest level that growth can continue without any kind of stress. (units: none) 
PRORTI 
Initial proportion of protein in new root tissue. (units: none) 
PROSHI 
Fraction protein of the shells when first produced. (units: none) 
PROSTF 
Proportion of protein in stems at the end of the season, after all possible nitrogen has been translocated to seeds. (units: none) 
PROSTG 
Protein content of the stem at the lowest level that growth can continue without any kind of stress. (units: none) 
PROSTI 
Initial proportion of protein in new leaf tissue (units: none) 
PRTLF 
Percent of root flux (cm/m^{2}) destroyed. (units: %/d) 
PRTLV 
Percent of root length density destroyed. (units: %/d) 
PRTMD 
Percent of root mass destroyed. (units: %/d) 
PSDDL 
Percent of seed destroyed that are large. (units: %/d) 
PSDDM 
Percent of seed destroyed that are mature. (units: %/d) 
PSDDS 
Percent of seed destroyed that are small. (units: %/d) 
PSHDL 
Percent of shells destroyed that contain large seed. (units: %/d) 
PSHDM 
Percent of shells destroyed that contain mature seed. (units: %/d) 
PSHDS 
Percent of shells destroyed that contain small seed. (units: %/d) 
PSTHD 
Column headers from each pest progress curve. 
PSTMD 
Percent of stem mass destroyed. (units: g/m^{2}/d) 
PTTN 
Minimum soil temperature limits (units: ^{o}C) 
PTX 
Maximum soil temperature limits (units: ^{o}C) 
PUNCSD 

PUNCTR 

PWDINF 
First day of year for planting window. (units: ) 
PWDINL 
Last day of year for planting window. (units: ) 
RAMT 
Amount of material resource produced. (units: ) 
RANC 
Root actual N concentration (units: g [N] / g [DM]) 
RATIO 

RCANHT 
Rate of height growth on current day. (units: ) 
RCANWH 
Rate of width growth on current day. (units: ) 
RCH2O 
Respiration cost for storing carbohydrates (units: none) 
RCNP 
Root critical N concentration (units: g [N] / g [DW]). If RANC > RCNP, no extra growth occurs. 
RDOY 

REDPUN 
The fraction reduction in seed growth due to insect puncture (01.0) (units: none) 
REDSHL 
We should have the amount of protein mass lost from each shell cohort. KJB can not decipher from code. WB help is needed, because shelling % can exceed genetic limits if we do not account for this. (units: g/m^{2}) 
RFAC 
Root factor: the combined effect on N uptake of root length density RLV, soil water factor SMDFR and depth of the layer (range 01) 
RFAC2 
Maximum increase in root depth per physiological day if there is no water stress. (units: cm/physiological d) 
RFLWAB 
Maximum relative rate of flower abortion per day if nightlength is not optimum or if there is no available soil water in the pegging zone. Latter for peanut only. (0.01.0) (units: none) 
RGFILL 
Rate of grain fill (units: mg/d) 
RHGHT 
Genetic coefficient to allow description of height reference cultivars. (units: ) 
RL 
Canopy resistance factor. (units: ) 
RLC 
Canopy resistance factor. (units: ) 
RLDF 
A root length density factor for soil layer L used to new root growth distribution. (units: none) 
RLF 
Leaf stomatal resistance at 330.0 ppm CO2 (units: s/m) 
RLFC 
Leaf stomatal resistance at other CO2 conc. (units: s/m) 
RLFDOT 
Daily root length flux damage (units: cm root / cm^{2} ground) 
RLNEW 
New root length to be added to the total root system length (units: cm root/cm^{2} ground) 
RLV 
Root length density (units: cm [root] / cm^{3} [soil]) 
RMNC 
Root minimum nitrogen concentration (units: g N/g root dry weight) 
RMON 

RNAM 
Type of material resource involved (none for tillage). (units: ) 
RNAME 

RNFAC 
Zero to unity factor describing mineral N availability effect on root growth in layer L. (units: none) 
RNH4 
Ammonium uptake (units: kg N/ha) 
RNLAB 

RNLF 
Intermediate factor (range: 01) used to calculate distribution of new growth in the soil. (units: none) 
RNO3C 
Respiration requirement to take up nitrogen and reduce it to amino acid, on a protein basis. (units: none) 
RNO3U 
Nitrate uptake (units: kg N/ha) 
RNOUT 

ROWSPC 
Spacing between adjacent rows of soybeans. (units: m) 
RPROAV 
Respiration cost for synthesizing protein which will go into vegetative tissue. (units: none) 
RPRPUN 

RSD 
Calculated ratio of supply to demand for seed growth. Available carbon and nitrogen considered. (units: none) 
RTEXF 
Fraction root death per day under oxygen depleted soil when soil is completely saturated. (units: ) 
RTNH4 
Ammonium uptake per unit root length (units: mg N/cm) 
RTNO3 
Nitrate uptake per unit root length (units: mg N/cm) 
RTR 

RTSURV 
Fraction survival of roots on a given day, taking into account death due to excess or deficit water conditions. (units: ) 
RTSW 
Weight of an average stem plus ear relative to a potential stem plus ear. (units: ) 
RTWT 
Total weight of roots (units: g/m^{2}) 
RUNT 
Units for material resource. (units: ) 
RVSTGE 
Rate of vegetative stage progression. (units: ) 
RWIDTH 
Genetic coefficient to allow description of width of reference cultivars. (units: ) 
S0N 
Normal (perp.) extraterrestial radiation (set equal to average solar constant; elliptical orbit ignored). (units: ) 
SAT 
Saturated soil water content in layer L (units: cm^{3}/cm^{3}) 
SATFAC 
Root length weighted soil water excess stress factor (0=no stress; 1=saturated stress ). (units: ) 
SCLEAR 
Clear sky radiation (units: MJ) 
SDDES 
Number of seed destroyed in each cohort by pests. (units: #/m^{2}) 
SDGR 
Potential seed growth rate per seed as determined by temperature, photoperiod, and disease set in DEMAND subroutine, also based on genetic input of a cultivar. (units: ) 
SDIDOT 
Number of seed destroyed by pests. (units: #/m^{2}/d) 
SDMAX 
The maximum dry weight gain left for each seed until it fills the shell. Computed for each cohort, depends on THRESH, WTSHE(NPP), WTSD(NPP), and REDSHL (units: g/seed?) 
SDMAXX 
Maximum possible seed weight for a given pod weight. Check for each pod cohort depends on THRESH, WTSHE(NPP), and protein lost from the shell (REDSHL). (units: g/seed?) 
SDNO 
The number of seeds in cohort J. Seed number is determined initially from SHELN (NPP), SDPDVR, DRPP, AVTEM, SHRAT. (units: #/m^{2}) 
SDPDVR 
The genetic parameter for potential seed number per pod. (units: #/pod) 
SDSUM 
Total weight of seeds per meter square. Goes to output. (units: g/m^{2}) 
SDVAR 
Compute reproductive rates from cultivar and ecotype coefficients. (units: ) 
SDWT 
Total weight of all seeds. (units: g/m^{2}) 
SDWTPL 
Initial planting material dry weight (units: kg/ha) 
SEEDNO 
Total number of seed per meter square. Goes to output. (units: #/m^{2}) 
SETMAX 
Cumulative ratio of supply to demand for a given cohort of shells, below which a fraction of shells (and seeds) are aborted in proportion to the ratio (1SHRAT). (In parameter file) (units: none) 
SFAC 

SHELN 
The number of shells in cohort J. Shell number is determined initially from the minimum of the ratios PODADD, PGNPOD/SHMAXG*AGRSH1, FLADD, and NAVPOD/SHMAXG*FNINSH. (units: #/m^{2}) 
SHELWT 
???????? Maximum shell weight of mature pod??? (units: g tissue/m^{2}) 
SHELWT 
Total weight of all shells. (units: g/m^{2}) 
SHLSUM 
Total weight of shells per meter square. Goes to output. (units: g/m^{2}) 
SHMAXG 
The maximum growth rate per shell. Calculated from genetic input SHVAR. Note from KJB. Why use it instead of GRRAT1? Such a nitpicky difference. Acts only for a few cohorts. (units: g tissue /shell/d) 
SHMINE 
Protein mass mined from shell tissue for seed growth. (units: g shell tissue/m^{2}) 
SHRAT 
The supply:demand ratio for pod abortion. (units: ) 
SHTHIC 
Fraction of potential shell growth rate that can occur after shells are fully expanded and beyond the LNGSH phase. Used only for PNUTGRO. Secondary thickening as protein is mobilized. Does this really work much if seed have first priority? (units: none) 
SHVAR 
Potential rate of dry matter accumulation per shell at optimum assimilate supply, temperatures, photoperiod, and water status. (units: ? /shell) 
SKERWT 
Weight of a single kernel (units: g) 
SKGN 

SLA 
Specific leaf area. (units: cm^{2}/g) 
SLAMN 
The minimum specific leaf area (SLA) for new peanut leaves when grown under infinitely high radiation, optimum water and temperature for variety I, modified in VARTY. (units: cm^{2}/g) 
SLAMX 
The maximum specific leaf area (SLA) for new peanut leaves when grown under low (nearly zero) radiation but optimum water and temperature for variety I, modified in the subroutine VARTY. (units: cm^{2}/g) 
SLAPAR 

SLDOT 
Daily leaf mass senesenced. (units: g/m^{2}/d) 
SLFC 

SLFT 

SLFW 

SMC(L,K) 
Soil water resease point, layer L, SWP K (units: cm^{3}/cm^{3}) 
SMDFR 
Relative drought factor. (units: ) 
SMDFR 
Soil water factor which reduces potential plant uptake of water (range 01). Lower values near saturation because of anaerobiosis and reduced root function. 
SN1 

SNACT 
Specific nodule activity. (units: ) 
SNACTM 
Maximum activity of the nodules. (units: ) 
SNDN 
Sunset. (units: ) 
SNUP 
Sunrise. (units: ) 
SOC 
Sun angles (limited for latitudes above polar circles). (units: ) 
SOILNC 

SOILNX 

SPPM 

SRDOT 
Daily senescence of roots. (units: g/m^{2}/d) 
SSDOT 
Daily senescence of petioles. (units: g/m^{2}/d) 
START 
Set equal to initial shell number (nonaborted number) when shell number is being reduced because of low supply/demand ratio, for a given cohort. (units: #/m^{2}) 
STMTOT 
Total cumulative stem mass produced. (units: g/m^{2}) 
STMTOT 
Total stem mass before damage. (units: ) 
STMWT 
Total stem weight. (units: g/m^{2}) 
STNAME(I) 
Defines names of reproductive phases. (units: ) 
SUMEX 
Sum over all layers of water excess factor times depth times root length density. (units: ) 
SUMRL 
Sum of root length density (integral over depth). (units: ) 
SUPDAY 
Today's ratio of minimum of carbohydrate supply to C demand or N supply to N demand, computed for each cohort of shells from formation through the LAGSD phase to determine fraction of shells and seeds to add in that cohort. Computed in order of age, so SUPDAY could be 1.0 for first shells and 0.0 for youngest. (units: none) 
SUPDE 
The cumulative average supplydemand ratio (for both C and N) for shells formed on day J. (units: none) 
SUPPN 
Total supply of nitrogen, based on fixation uptake and mining. (units: g N/m^{2}/d) 
SW 
Actual soil water content in layer L. (units: cm^{3}/cm^{3}) 
SWADD 
Determined from a look up function using the variables YSWFAC, XSWFAC, TURFAC, NSWFAC for the determination of pegging zone soil water effect on the addition of pegs.... supposed to be only for PNUTGRO. Supposed to be SWFAC. Rethink this for bean and soybean. KJB. (units: none) 
SWDF 
Soil water deficit factor (range 01) for layer L used to calculate root growth and water uptake. (units: ) 
SWDF2 
Drought stress 
SWEF 
Soil water evaporation fraction. The fraction of the LL water content that determines the lowest possible value that the top soil layer water content can reach by soil evaporation. The value depends on the depth of the first layer. (units: ) 
SWFAC 
Ratio of root water uptake to potential climatic evaporative demand. Should be used in the tabex function for determining SWADD. (units: none) 
SWFAC 
Soil water stress factor. (units: ) 
SWFACT 
Soil water deficit effect on N2 fixation and nodule growth. (units: ) 
SWIDOT 
Dry weight of seeds lost due to damage by insects on the current day of simulation (currently not used in PNUTGRO). (units: g/m^{2}/d) 
SWP(K) 
Soil water potential value for SMC curve (units: cm) 
SWPLTD 
Depth to which average soil moisture is determined (units: cm) 
SWPLTH 
Upper limits on soil moisture (units: %) 
SWPLTL 
Lower limits on soil moisture (units: %) 
TA 

TAIRHR 
Hourly air temperature. (units: ^{o}C) 
Tb(L) 
Bubbling pressure for soil, layer L (units: cm) 
TC1 

TC2 

TCNP 
Critical N concentration in plant tops (units: g [N] / g [DW]). If TANC > TCNP, no extra growth occurs. 
TDEPTH 
Root zone depth 
TDLA 
Absolute daily percent diseased leaf area. (units: m^{2}/m^{2}) 
TDLA 
Diseased leaf area (see also PDLA). (units: ) 
TDRAIN 

TDUMX2 
The rate of photothermal progress calculated in GPHEN, both temperature and photoperiod dependent. Check it again after resolving GPHEN. (units: ) 
TEMPMN 
Mean temperature 
TEMPOD 
Effect of temperature on rate of flower, shell, and seed addition based in part on the Borthwich and Parker data, with lower cut off based on Raper and Thomas. Relative rate between 0.0 and 1.0. KJB. Rethink this. (units: none) 
TEMXFR 
Effect of temperature on partitioning to fruits (XFRUIT), 0 to 1.0. (units: ) 
TFAC 

THRESH 
The maximum ratio (seed/(seed+pod)) at maturity. Determines the maximum dry weight gain by seeds until seed fill shell. A genetic input. (units: none) 
TI 
Fraction of a phyllochron interval which occurred as a of today's daily thermal time. (units: ) 
TLCH 

TLFAD 
Total leaf area damaged. (units: cm^{2}/cm^{2}/d) 
TLFMD 
Total leaf mass destroyed. (units: g/m^{2}/d) 
TLG 

TMAX 
Maximum temperature of the day. (units: ^{o}C) 
TMIN 
Minimum temper ature of the day. (units: ^{o}C) 
TMINER 

TNFIX 
Soil T effect on N2 fixation. (units: ) 
TNGRO 
Soil T effect on nodule growth. (units: ) 
TNLAB 

TNOLD 

TNOX 

TOPWT 
Weight of leaves, stems, and pods. (units: g/m^{2}) 
TOTIR 
Total irrigation (units: mm) 
TOTWT 
Total weight of all plant components. (units: g/m^{2}) 
TPHFAC 
Reduction in photosynthesis due to daytime temperature being less than optimal, factor between 0 and 1. (units: ) 
TPHFAC 
Reduction in specific leaf area (SLA) due to 24hour temperature being less than optimal, factor between 0 and 1. (units: ) 
TPSR 
Total Photosynthesis reduction. (units: g/m^{2}/d) 
TRLDF 
An intermediate calculation used to calculate distribution of new root growth in soil. (units: ) 
TRLV 
Total root length volume. (units: ) 
TRNU 
Potential N uptake from the whole profile 
TRNU 
Total nitrogen uptake. (units: g N/m^{2}/d) 
TRNU 
Potential N uptake in soil layers with roots. (units: ) 
TRTLF 
Total root flux (cm/m^{2}) destroyed. (units: cm/cm^{2}/d) 
TRTLV 
Total root length density destroyed. (units: cm/cm^{3}/d) 
TRUNOF 

TSDEP 
Computed soil temperature to 10 cm depth. (units: ^{o}C) 
TSDNO 
Total seed number in all cohorts. (units: #/m^{2}) 
TSDWT 
Total seed mass in all cohorts. (units: g/m^{2}) 
TSHNO 
Total shell number in all cohorts. (units: #/m^{2}) 
TSHWT 
Total shell mass in all cohorts. (units: g/m^{2}) 
TSIN 

TSOC 

TSON 

TT 

TTMP 

TURFAC 
Used in the tabex function for determining SWADD. Should use SWFAC. KJB. (units: none) 
TURFAC 
Factor which reduces leaf expansion as a function of water stress. TURFAC also affects partitioning and leaf abscission. (units: ) 
TURSEN 
Constant which describes the exponential shape of shift in partitioning to fruits versus the ratio of soilroot water supply to actual plant transpirative demand (currently not used in PNUTGRO). (units: ) 
TURSLA 
Turgor effect on specific leaf area. (units: none) 
VANC 
Actual N concentration in vegetative plant parts (units: g [N] / [plant]) 
VGRDEM 
Vegetative tissue growth demand after seeds and pods are grown. (units: g/m^{2}/d) 
VMNC 
Minimum N concentration in vegetative plant parts (units: g [N] / g [DW]) 
VNDEM 
Demand of nitrogen for growth of vegetative tissue (leaf, stem, root) at a certain partitioning level. (units: g N/m^{2}/d) 
VSSINK 
Vegetative stage beyond which sinklimited leaf area expansion can no longer limit photosynthesis or leaf area growth. (units: ) 
VSTAGE 
Vegetative stage of growth (number of nodes on mainstem). (units: ) 
W1 

WC 
Moisture content affect on soil temperature. (units: ) 
WCRLF 
Weight of carbon reserves in the leaves. (units: g CH2O/m^{2}/d) 
WCRRT 
Weight of carbon reserves in the roots. (units: g CH2O/m^{2}/d) 
WCRSH 
Weight of carbon reserves in shells. (units: g CH2O/m^{2}/d) 
WCRST 
Weight of carbon reserves in stems. (units: g CH2O/m^{2}/d) 
WDHT 
Weed height on current day (units: m) 
WDOT 
Change in dry weight of crop. (units: g/m^{2}/d) 
WDSIZ 
Weed height when operation was performed (units: m) 
WEFFIC 
Efficacy of weed control operation (units: %) 
WIND2 
Windspeed to 2 m reference height. 
WLDOT 
Change in dry weight of leaves. (units: g/m^{2}/d) 
WLDOTN 
Actual rate of new leaf growth. (units: g/m^{2}/d) 
WLIDOT 
Dry weight of leaves eaten by insects on a given day, or frozen by low temperature (and thus removed). (units: g/m^{2}/d) 
WNDOT 
Change in dry weight of nodules. (units: g/m^{2}/d) 
WPDOT 
Change in dry weight of pods (seeds + shells). (units: g/m^{2}/d) 
WRDOT 
Change in dry weight of roots. (units: g/m^{2}/d) 
WRDOTN 
Actual rate of new root growth. (units: g/m^{2}/d) 
WRIDOT 
Daily root mass destroyed due to pest damage (units: g/m^{2}/d) 
WRTMD 
Weight of roots destroyed. (units: g/m^{2}/d) 
WSDDL 
Weight of large seed destroyed. (units: g/m^{2}/d) 
WSDDM 
Weight of mature seed destroyed. (units: g/m^{2}/d) 
WSDDOT 
Change in dry weight of seeds per day. (units: g/m^{2}/d) 
WSDDS 
Weight of small seed destroyed. (units: g/m^{2}/d) 
WSDDTN 
Actual rate of new seed growth. (units: g/m^{2}/d) 
WSDOT 
Change in dry weight of stems. (units: g/m^{2}/d) 
WSDOTN 
Actual rate of new stem growth. (units: g/m^{2}/d) 
WSHDL 
Weight of shells destroyed that contain large seed. (units: g/m^{2}/d) 
WSHDM 
Weight of shells destroyed that contain mature seed. (units: g/m^{2}/d) 
WSHDOT 
Change in dry weight of shells per day. (units: g/m^{2}/d) 
WSHDS 
Weight of shells destroyed that contain small seed. (units: g/m^{2}/d) 
WSHDTN 
Actual rate of new shell growth. (units: g/m^{2}/d) 
WSHIDT 
Dry weight of shells lost due to abortion due to insect damage on the current day of simulation (currently not used in PNUTGRO) (units: g/m^{2}/d) 
WSHIDT 
Total shell mass destroyed by pests. (units: g/m^{2}/d) 
WSIDOT 
Daily change in stem dry mass due to pest damage. (units: g/m^{2}/d) 
WSTMD 
Weight of stem mass destroyed. (units: g/m^{2}/d) 
WSTR 

WTABR 
Weight of aborted pods for shell cohort J. (units: g tissue/m^{2}) 
WTABRT 
Total mass of shells aborted on a given date due to inadequate assimilate supply or temperature. (units: g/m^{2}) 
WTHADJ 
Weather modification array (2x8) containing offset and multiplier for each variable (1=DAYL, 2=SRAD, 3=TMAX, 4=TMIN, 5=RAIN, 6=RH, 7=WIND, 8=CO2). (units: ) 
WTLF 
Total leaf weight, a state variable. (units: g/m^{2}/d) 
WTNALL 
Sum of all N that accumulated in all plant components. (units: g/m^{2}) 
WTNHAR 
Sum of N in all plant components at harvest. (units: g/m^{2}) 
WTNLA 
All of the N that entered leaves. (units: g/m^{2}) 
WTNLF 
N present at harvest in leaves. (units: g/m^{2}) 
WTNLO 
N lost due to senescence of leaves. (units: g/m^{2}) 
WTNNA 
All of the N that entered nodules. (units: g/m^{2}) 
WTNNAG 

WTNNO 
N lost due to senescence of nodules. (units: g/m^{2}) 
WTNNOD 
N present at harvest in nodules. (units: g/m^{2}) 
WTNOFF 
Sum of N in all plant components that senesced (units: g/m^{2}) 
WTNRA 
All of the N that entered roots (units: g/m^{2}) 
WTNRO 
N lost due to senescence of roots (units: g/m^{2}) 
WTNRT 
N present at harvest in roots (units: g/m^{2}) 
WTNSA 
All of the N that entered stems (units: g/m^{2}) 
WTNSD 
N present at harvest in seed (units: g/m^{2}) 
WTNSDA 
All of the N that entered seeds (units: g/m^{2}) 
WTNSDO 
N lost due to senescence of seed (units: g/m^{2}) 
WTNSH 
N present at harvest in shell (units: g/m^{2}) 
WTNSHA 
All of the N that entered shell (units: g/m^{2}) 
WTNSHO 
N lost due to senescence of shell (units: g/m^{2}) 
WTNSO 
N lost due to senescence of stems (units: g/m^{2}) 
WTNST 
N present at harvest in stems (units: g/m^{2}) 
WTSD 
The seed weight for cohort J. (units: g tissue/m^{2}) 
WTSHDTN 
Total shell weight added for a given day. (units: g tissue/m^{2}/d) 
WTSHE 
The shell weight for cohort J. (units: g tissue/m^{2}) 
WTSHM 
The weight of mature or full shells. (units: g tissue/m^{2}) 
WTSHMT 
The weight of shells that have reached THRESH (seed filled pod) today. (units: g tissue/m^{2}) 
WTSHMY 
Yesterday's weight of mature or full shells. (units: g tissue/m^{2}) 
XFRMAX 
Maximum increase in partitioning to fruit under severe water stress. (does not apply for soybean, peanut or bean?) (units: none) 
XFRT 
Internal use, set by XFRUIT, maximum partitioning of dry matter for seed growth. (units: %) 
XFRT 
Current day's partitioning into reproductive growth, based on a genetic coefficientXFRUIT. (units: none) 
XFRUIT 
Maximum partitioning of dry matter for seed growth. Variable equals 1.00 except for peanuts. (units: %) 
XFRUIT 
Genetic coefficient that quantifies a specific variety's maximum partitioning of photosynthates to reproductive growth. (units: none) 
XHWDL 
Should represent the effect of day length on length of internodes (not used at present). (units: ) 
XHWPAR 
Array of photosynthetically active radiation values describing the effects of PAR on length of internodes. (units: mol/m^{2}/d) 
XHWTEM 
Array of temperature values in temperature look up table which describe the effect of temperature on the length of internodes. (units: ^{o}C) 
XHWTUR 
Array of relative values of water stress which describe the effect of turgor on extension (values of 0 to 1.0). (units: none) 
XI 
Noninteger Julian date. (units: ) 
XLEAF 
Vstage at which partitioning to leaves is YLEAF(I). (units: ) 
XLFWT 

XMIN 

XNF 

XRTFAC 
Vstage at which rate of increase in root depth per physiological day is YRTFAC(I)  constant rate throughout the season now. (units: ) 
XSLATM 
Array of temperature values in table look up describing the effect of temperature on specific leaf area. (units: ^{o}C) 
XSTEM 
Vstage at which partitioning to stems is YSTEM(I). (units: ) 
XSWFAC 
Used in the tabex function for determining SWADD. (units: none) 
XTN 

XVGROW 
Vstage by which maximum leaf area growth per plant since emergence is YVGROW(I). (units: ) 
XVSHT 
Array of Vstage progression which describes the normal height of a variety. (units: ) 
XVSWH 
Array of Vstage progression which describes the normal width of a variety. (units: ) 
XX 
Difference between partitioning fraction to stems at beginning bloom (R1) and at the day on which the maximum number of Vstages occurs (NDLEAF). (units: ) 
XXFTEM 
Array of temperature values in table lookup describing effect of temperature on partitioning to pods (YXFTEM = 0 TO 1). (units: ^{o}C) 
Y1 
Temporary variable used in calculation of PCARB. (units: ) 
YHWDL 
Should represent the effect of daylength on length of internodes (not used at present). (units: ) 
YHWPAR 
Array which describes the inverse relation between PAR and length of internodes. (units: none) 
YHWTEM 
Array which describes the decrease in length of internodes as temperatures are cooler. (units: none) 
YHWTUR 
Array which describes the decrease in length of internodes as water shortage increases. (units: none) 
YLEAF 
Partitioning fraction to leaves at Vstage XLEAF(I). (units: ) 
YRDOY 
Day of year. (units: ) 
YRPLT 
Computed planting date. (units: ) 
YRTFAC 
Rate of increase in root depth per degree day at Vstage XRTFAC(I). (units: ) 
YSLATM 
Array which describes the effect of temperature on specific leaf area. (units: ) 
YSTEM 
Partitioning factor for stem growth at Vstage XSTEM(I). (units: ) 
YSWFAC 
Used in the tabex function for determining SWADD. (units: none) 
YVGROW 
Maximum leaf area grown per plant by Vstage XVGROW(I). (units: cm^{2}/plant) 
YVSHT 
Array of Vstage progression which describes the normal height of a variety. (units: ) 
YVSWH 
Array of Vstage progression which describes the normal width of a variety. (units: ) 
YXFTEM 
Array which describes the effect of temperature on relative partitioning to pods. (units: oC) 
YY 
Internal variable used to linearly interpolate the difference in partitioning to leaves between stages R1 and NDLEAF. (units: none) 
ZD 
Variable used in the calculation of soil temperature. (units: ) 