Crop parameter table
crop-parameters.RmdThis table lists the crop parameters that can be adjusted in the
aquacrop_wrapper() function. Please refer to the AquaCrop
manual for a better understanding of conservative parameters.
| Parameter | Explanation | Note |
|---|---|---|
crop_type |
fruit/grain producing crop (2), root/tuber crop (3) | |
sow_type |
Crop is transplanted (0) or sown (1) | |
crop_cycle |
Determination of crop cycle: by calendar days (1) or by growing degree days (0) | This has consequences on parameters that are taken into account |
p_factors |
Soil water depletion factors (p) are adjusted by ETo | |
T_base |
Base temperature (degC) below which crop development does not progress | |
T_max |
Maximum temperature (degC) above which crop development no longer increases with an increase in temperature | |
cycle_len_gdd |
Total length of crop cycle in growing degree-days | only when in gdd mode (crop_cycle == 0) |
pexp_up |
Soil water depletion factor for canopy expansion (p-exp) - Upper threshold | |
pexp_lo |
Soil water depletion factor for canopy expansion (p-exp) - Lower threshold | |
pexp_sh |
Shape factor for water stress coefficient for canopy expansion | 0.0 = straight line |
psto_up |
Soil water depletion fraction for stomatal control (p - sto) - Upper threshold | |
psto_sh |
Shape factor for water stress coefficient for stomatal control | 0.0 = straight line |
psen_up |
Soil water depletion factor for canopy senescence (p - sen) - Upper threshold | |
psen_sh |
Shape factor for water stress coefficient for canopy senescence | 0.0 = straight line |
sen_ET |
Sum(ETo) during dormant period to be exceeded before crop is permanently wilted | |
ppol_up |
Soil water depletion factor for pollination (p - pol) - Upper threshold | |
vwc_anaer |
Vol% for Anaerobiotic point (* (SAT - [vol%]) at which deficient aeration occurs *) | |
calib_fert |
Considered soil fertility stress for calibration of stress response (%) | |
resp_exp |
Shape factor of canopy expansion to fertility stress | 25.00 = not considered; 2.16 = default |
resp_max |
Shape factor of maximum canopy cover to fertility stress | 25.00 = not considered; 0.79 = default |
resp_wp |
Shape factor of crop Water Productivity to fertility stress | 25.00 = not considered; 1.67 = default |
resp_sen |
Shape factor of decline of canopy cover to fertility stress | 25.00 = not considered; 1.67 = default |
dummy_1 |
dummy - Parameter no Longer required | |
Tpol_lo |
Minimum air temperature below which pollination starts to fail (cold stress) (degC) | |
Tpol_up |
Maximum air temperature above which pollination starts to fail (heat stress) (degC) | |
Ttra_lo |
Minimum growing degrees required for full crop transpiration (degC day) | |
ec_lo |
Electrical Conductivity of soil saturation extract at which crop starts to be affected by soil salinity (dS/m) | |
ec_up |
Electrical Conductivity of soil saturation extract at which crop can no longer grow (dS/m) | |
dummy_2 |
Dummy - no longer applicable | not in use |
salexp |
Calibrated distortion (%) of CC due to salinity stress | Range: 0 (none) to +100 (very strong) |
salsto |
Calibrated response (%) of stomata stress to ECsw | Range: 0 (none) to +200 (extreme) |
kc_max |
Crop coefficient when canopy is complete but prior to senescence (KcTr,x) | |
kc_dec |
Decline of crop coefficient (%/day) as a result of ageing, nitrogen deficiency, etc. | |
rt_min |
Minimum effective rooting depth (m) | |
rt_max |
Maximum effective rooting depth (m) | |
rt_sh |
Shape factor describing root zone expansion | |
rtex_up |
Maximum root water extraction (m3water/m3soil.day) in top quarter of root zone | |
rtex_lo |
Maximum root water extraction (m3water/m3soil.day) in bottom quarter of root zone | |
eva_rdc |
Effect of canopy cover in reducing soil evaporation in late season stage | |
ccs_1 |
Soil surface covered by an individual seedling at 90 % emergence (cm2) | |
ccs_2 |
Canopy size of individual plant (re-growth) at 1st day (cm2) | only for perennials |
plant_dens |
Number of plants per hectare | |
cgc |
Canopy growth coefficient (CGC): Increase in canopy cover (fraction soil cover per day) | only when in day mode (crop_cycle == 1) |
cgc_dec |
Number of years at which CCx declines to 90 % of its value due to self-thinning | only for multiple years (not tested) |
cgc_decx |
Shape factor of the decline of CCx over the years due to self-thinning | only for multiple years (not tested) |
cgc_dec_sh |
dummy - Parameter no Longer required | not in use |
ccx |
Maximum canopy cover (CCx) in fraction soil cover | |
cdc |
Canopy decline coefficient (CDC): Decrease in canopy cover (in fraction per day) | only when in day mode (crop_cycle == 1) |
eme_d |
Calendar Days from sowing to emergence | only when in day mode (crop_cycle == 1) |
root_d |
Calendar Days from sowing to maximum rooting depth | only when in day mode (crop_cycle == 1) |
sen_d |
Calendar Days from sowing to start senescence | only when in day mode (crop_cycle == 1) |
cyc_d |
Calendar Days from sowing to maturity (length of crop cycle) | only when in day mode (crop_cycle == 1) |
flo_d |
Calendar Days from sowing to flowering | only when in day mode (crop_cycle == 1) |
flolen_d |
Length of the flowering stage (days) | only when in day mode (crop_cycle == 1) |
deter |
Crop determinancy unlinked with flowering (0), linked with flowering (1) | |
fruit_exc |
Excess of potential fruits (%) | |
hilen_d |
Building up of Harvest Index starting at flowering (days) | only when in day mode (crop_cycle == 1) |
wp_ref |
Water Productivity normalized for ETo and CO2 (WP*) (gram/m2) | |
wp_yld |
Water Productivity normalized for ETo and CO2 during yield formation (as % WP*) | |
perf_co2 |
Crop performance under elevated atmospheric CO2 concentration (%) | |
hi_ref |
Reference Harvest Index (HIo) (%) | |
hi_stress |
Possible increase (%) of HI due to water stress before flowering | |
hi_veget |
Coefficient describing positive impact on HI of restricted vegetative growth during yield formation | |
hi_sto |
Coefficient describing negative impact on HI of stomatal closure during yield formation | |
hi_max |
Allowable maximum increase (%) of specified HI | |
eme_gdd |
GDDays from sowing to emergence | only when in gdd mode (crop_cycle == 0) |
root_gdd |
GDDays from sowing to maximum rooting depth | only when in gdd mode (crop_cycle == 0) |
sen_gdd |
GDDays from sowing to start senescence | only when in gdd mode (crop_cycle == 0) |
mat_gdd |
GDDays from sowing to maturity (length of crop cycle) | only when in gdd mode (crop_cycle == 0), equal to
cycle_len
|
flo_gdd |
GDDays from sowing to flowering | only when in gdd mode (crop_cycle == 0) |
flolen_gdd |
Length of the flowering stage (growing degree days) | only when in gdd mode (crop_cycle == 0) |
cgc_gdd |
CGC for GGDays Increase in canopy cover (in fraction soil cover per growing-degree day) | only when in gdd mode (crop_cycle == 0) |
cdc_gdd |
CDC for GGDays Decrease in canopy cover (in fraction per growing-degree day) | only when in gdd mode (crop_cycle == 0) |
hilen_gdd |
GDDays building-up of Harvest Index during yield formation | only when in gdd mode (crop_cycle == 0) |
dmc_yld |
dry matter content (%) of fresh yield | |
regr_rt_min |
Minimum effective rooting depth (m) in first year - required only in case of regrowth | only for perennials |
regr_plant |
Crop is transplanted in 1st year - required only in case of regrowth | only for perennials |
sh_rt |
Transfer of assimilates from above ground parts to root system is NOT considered | only for perennials |
storage_d |
Number of days at end of season during which assimilates are stored in root system | only for perennials |
perc_toroot |
Percentage of assimilates transferred to root system at last day of season | only for perennials |
perc_toshoot |
Percentage of stored assimilates transferred to above ground parts in next season | only for perennials |