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Modelling of yield of winter wheat as a function of soil water availability

Abstract:

Winter wheat field data from three different ecological regions were used to validate the performance of the SLEWW-WTGRO model. This model simulates total dry matter accumulation of a crop, assuming that soil water is the main growth-limiting variable. Field data used for the validation were all monitored on experimental sites with ample nutrient supply, and crop diseases and weed growth were kept under control. The present model differs from other modelling approaches in the sense that the model itself generates the leaf area extension without losing its simplicity or increasing the number of input variables considerably. Comparison of the simulation results with data of field experiments from Belgium, India and Iran permitted study of the model performance under a wide range of climatic and farming conditions. © 1987.