Calculating the water salt production function parameters of seed maize under water salt combination stress

In order to explore the relationship between crop yield and water salt stress, field experiments were conducted under deficit irrigation with saline water in Shiyang Rive Basin. It introduced into the crop-water-salt production function. The crop-water-salt production function parameters were calibrated and validated based on the field experiments measured data. The results showed that the simulated evapotranspiration and yield agreed well with the measured values of seed maize at different growth stages. The crop-water-salt production function parameters after calibration and validation were b=6.72, k(y1)=0.43, k(y2)=0.82, k(y3)=1.41, k(y4)=0.65, k(y5)=0.24, respectively. The yield response factor (k(y)) reflected sensitivity to the seed maize at different growth stages under water salt combination stress. The crop-water-salt production function can well simulate the seed maize evapotranspiration and yield under water salt combination stress after calibration and validation.