Simulation of Maize Yield under Water Stress with the EPICphase and CROPWAT Models
By J. Cavero, I. Farre, Philippe P. Debaeke, J. Faci. 2000
142 citations recorded by the source corpus.
Models that simulate the effects of water stress on crop yield can be valuable tools in irrigation. We evaluated the crop growth simulation model EPICphase and the model CROPWAT on their ability to simulate maize (Zea mays L.) grain yield reduction caused by water stress under semiarid conditions. The simulation of evapotranspiration (ET), harvest index (HI), leaf area index (LAI), and final biomass was also evaluated. Data from three field experiments were used to test the models. In one sprinkler-irrigated experiment, different water amounts (0-592 mm) were applied, producing a continuous water deficit. The other two experiments were flood-irrigated and water stress was imposed at given development stages of maize. EPICphase simulated the ET with a root mean square error (RMSE) of 40 mm. The regression of the EPICphase simulated vs. measured values of HI and yield had intercepts that were not significantly different from 0 and slopes not different from 1. EPICphase overestimated the biomass in the more water-stressed treatments (intercept of simulated vs. measured values = 5.25 t ha -1 ) due to overestimation of LAI. Modifications of EPICphase relative to the effect of water stress on LAI growth and on the light extinction coefficient improved the simulations of LAI, biomass, HI, and yield. CROPWAT calculated maize grain yield with a RMSE of 14% but overestimated ET in the flood-irrigated treatments (bias = 58 mm and 31 mm). Better simulation of ET by EPICphase makes this model more consistent for calculating yield reduction due to water stress.
Subfields: Ecology, Evolution, Behavior and Systematics, Plant Science, Soil Science
View Paper: https://www.semanticscholar.org/paper/42069b8130f9fc687f9ae5b11a90c980068f72cd
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In Soil Science
Citations in the corpus
- Historical Development and Applications of the EPIC and APEX Models (2004, background): “It is notable that second-generation usage of EPICphase has occurred in Spain, where the model has been further modified, validated, and applied for irrigation scenarios (Cavero et al. 2000; Santos et al. 2000; Cavero et al. 2001).”
- Application of AquaCrop model in deficit irrigation management of Winter wheat in arid region (2011, methodology): “CROPWAT model, as an appropriate tool for irrigation planning, is another example; but due to improper simulations of evapotranspiration, the crop yield reductions estimated by this model should be taken with caution (Cavero et al., 2000).”