CropSyst User Manual - sipeaa

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The fraction of GAI produced in each day is initialized with zero degree-days, and the thermal timeduring the life of this fraction is calculated daily as follows:whereCGD dayGDD green = CGD day · ( 1 + GAI sensitivity · StressIndex Water )is the computed accumulated thermal time.StressIndex water is the computed daily plant water stress index .is the leaf duration sensitivity to water stress crop input parameter.GAI sensitivityWhen the accumulated thermal time of any given fraction of GAI reaches the thermal time threshold setby the leaf duration crop input parameter , this fraction is assumed to senesce and it is subtracted fromthe total GAI.The leaf area index (LAI), which includes total leaf area (green or senescent) is equal to GAI duringactive growth of green area and declines after flowering to reach the value set by the fraction ofmaximum LAI at maturity crop input parameter .
Crop interceptionThe amount of water intercepted by the crop canopy is estimated from the fraction of canopy cover(fractCover_canopy) and the storage capacity of the canopy for water, assumed to be 1mm for fullcanopy cover ( Campbell and Diaz, 1988 ):Interception = 0.001 · fractCover canopy
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Cropping Systems Simulation ModelUs
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❍■■■■■■■■Soil■
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AbstractCropSyst is a is a user-fri
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This will save the currently edited
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The simulation will create a subdir
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DOS parameter editorTo run CropSyst
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●LocationThe remaining main menu
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edited.Simulation descriptionA desc
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Chemical simulationWhen enabled, ch
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NH4 - Ammonium (kg N/ha initial N)N
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Soil profile initializationCropSyst
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Crop and management rotation tableC
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extension). Create the management f
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Residue water content (m³/kg)refer
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This is different than long term sc
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Additional requirementsIn order for
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Running CropSyst from the DOS comma
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●●●●●●Green area indexT
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Management parameter editorCropSyst
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To delete an entry in the table, se
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January and December the year will
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specified if automatic irrigation i
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Based on biomassIn this mode, clipp
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Clipping fateFor either the Based o
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Contouring factorLand Slope Pc valu
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Based on nitrogen balanceNeed descr
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Tillage and residue stubble operati
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105 Irrigated soil dry 5 -SCSCode D
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119 Heavy double disc irrig. 36" 85
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Crop classificationThe first parame
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Crop planting parametersPlanting mo
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SoybeanSunflowerWheatGrass (cropped
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Thermal time to cease temperature l
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❍Actual transpiration.
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Maximum leaf area index (LAI)The le
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Soybean 1.4-1.8 4 - 7Sunflower 1.7-
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eginning of grain filling X X -phys
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(mm/day) 10.0 - - - - - - - - - - 1
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Vernalization day requirement to co
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Crop harvestHarvest classificationT
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Crop residueThe amount of residue p
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Crop nitrogenNitrogen fixationFor l
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Crop salinityOsmotic potential for
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Crop dormancyAverage temperature fo
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Soil parameter editorThe soil entry
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Soil volatilizationVolatilization o
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SCS Curve number runoffCropSyst use
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Soil texturePercent Sand, Clay, Sil
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Soil layersThe number of soil layer
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Information Source:❍ soil propert
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weather files and specify the prefi
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●●Arnold and William, 1989 .For
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❍parameters tableFor other sites,
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Min relative humidity, wind speedFo
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WindWind parameters are used by the
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Daily weather FilesWeather files ar
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General layout optionsCurrently the
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includes a balance for each chemica
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Arc CropSyst CoöperatorThe Arc Cro
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Using the ArcCS project editorThe p
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The output page is used to specify
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Questions●●What is a "combined
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Note that only the numeric fields a
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GIS Coverages/ThemesA GIS Coverage
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6940745.000000 21426.680000 71 70 2
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1.93 6.7 4 3 SOIL30.87 3.9 5 2 SOIL
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ArcCS outputsA number of output fil
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Error log fileA detailed error log
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Visualizing Coöperator outputsOnce
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Watershed wizardThe Watershed wizar
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Graphics viewerThis utility is avai
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Report viewerThis utility is availa
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Batch run editorThe batch run edito
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DOS version batch run editorLike th
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Hints & Trouble Shooting:1.CROPSYST
Page 154 and 155: Simulation modelThis model is a dai
Page 156 and 157: Infiltration and soil water storage
Page 158 and 159: PrecipitationPreciptation is taken
Page 160 and 161: Potential evapotranspirationThe pot
Page 162 and 163: Penman-Monteith evapotranspirationm
Page 164 and 165: Relhumid min % Is the minimum relat
Page 166 and 167: λ (MJ/kg)is the latent heat of vap
Page 168 and 169: Soil evaporationActual soil evapora
Page 170 and 171: Runoff simulationsTwo water runoff
Page 172 and 173: PAW * =nlΣPAW l [ Z l - Z l-1Z l]l
Page 174 and 175: Row crops Terraced Good D 64 81 92R
Page 176 and 177: Pasture or Range Straight row Good
Page 178 and 179: REI' day is 0 if no daily precipita
Page 180 and 181: contours that store moisture and re
Page 182 and 183: greater than air dry water content
Page 184 and 185: Original soil freezing modelThe soi
Page 186 and 187: whereRFI1 (C- days ) is the require
Page 188 and 189: The use of these equations is expla
Page 190 and 191: Crop growth and developmentThe crop
Page 192 and 193: Crop plantingCropSyst provides two
Page 194 and 195: RootingRoot growth occurs soon afte
Page 196 and 197: PhenologyThe stages of development
Page 198 and 199: Above ground biomass accumulationCr
Page 200 and 201: Crop TranspirationAs a function of
Page 202 and 203: C Tc · K · (ψ l,sc - ψ l,wilt )
Page 206 and 207: VernalizationVernalization in crops
Page 208 and 209: Photo-periodPlant development may r
Page 210 and 211: Residue surface (kg/m²) is the amo
Page 212 and 213: Nitrogen-dependent growthThe values
Page 214 and 215: CNU (kg/m²)is cumulative nitrogen
Page 216 and 217: UP max (kg N/day/m)is the maximum n
Page 218 and 219: Fix w is constrained to the range [
Page 220 and 221: C out (kg N/m³ water) is the nitro
Page 222 and 223: NRATE 35 = 0.8 (1/day) is the nitri
Page 224 and 225: Actual residue evaporationActual re
Page 226 and 227: Residue decompositionThe residue le
Page 228 and 229: Note: Subsurface residues (shallow,
Page 230 and 231: Irrigation management simulationAut
Page 232 and 233: Simulation of the affects of tillag
Page 234 and 235: steepness factor for the universal
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CropSyst User Manual - sipeaa

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