Evaluation of the AquaCrop Model in the simulation of the simultaneous effect of different water regimes and salinity on soybean's productivity and yield in the North of Iran

the aim of this study was feasibility of integration of saline water and fresh groundwater for soybean irrigation and Performance evaluation of AquaCrop model at the research field of Gorgan University of Agricultural Science and Natural Resources in the Golestan Province ,northern Iran. For this purpose, the AquaCrop model with salinity module (FAO-۲۰۱۲) was calibrated and validated with soybean crop data of ۲۰۱۳and ۲۰۱۴, by grain yield, biomass yield and water productivity under varying irrigation and salinity regimes. Irrigation applications comprised irrigation at ۷۵% of field capacity (I۱); at ۱۰۰ % FC (I۲); and over irrigation ۱۲۵% FC (I۳). The salinity application levels were fresh water with Electrical conductivity about ۰.۸۶ (S۱); ۵ (S۲) and ۸ dS/m (S۳).The different saline water were made with mixing a ratio of the Caspian Sea water (ECw=۲۶.۵ dS/m) and fresh water. Model efficiency (E), coefficient of determination (R۲), Root Mean Square error (RMSE) and Mean Absolute Error (MAE) were used to test the model performance. The model was calibrated for simulating soybean grain and biomass yield for all treatment levels with the prediction error statistics ۰.۹۷

کلیدواژه ها:

Biomass ، Salinity ، Water deficit ، Water productivity