ISI-MIPagriculture simulations

7 Global Gridded Crop Models:

EPIC, GEPIC, IMAGE, LPJ-GUESS, LPJmL, pDSSAT, PEGASUS

4 first priority crops:

wheat, maize, rice, soy

(LPJmL and EPIC also provide simulations for additional crops)

Minimal scenario set-up

Ouput variablesVariable Variable name resolution unit comment

Crop yields Yield_<crop> annual(0.5°x0.5°)

dry matter t/ha/yr(t ha 1 yr 1)‐ ‐

Crop specific‐

Irrigation waterdemand (potentialirrigation waterWithdrawal)

PIrrWW_<crop> annual(0.5°x0.5°)

kg/m2/s(kg m 2 s 1)‐ ‐

Irrigation waterneeded for anoptimal irrigation (inaddition to rainfall) ,assuming unlimitedwater supply, theirrigation wateramount should beaveraged over thewhole year

Additional variables: actual evapotranspiration, fertilizer application rates, growing season dates

Management settingsModellers were asked to provide simulations based on their „default present day“

setting which may be very different.

model Fertilizer use Adaptation starting conditions (representation of

present day yields or potential yields?)

EPICEnvironmental Policy Integrated Climate

flexible N application rates (N-stress free days in 90% of crop growing period to an upper application limit of 200 kg ha-1) Constant P application rates.

annual adjustment of planting dates; total heat units to reach maturity remain constant no adjustment of cultivars

present day potential yields

LPJmL Soil nutrient limiting factors are not accounted for

Fixed sowing dates, total heat units to reach maturity remain constant

present day yields (10)

Results