Simulation Of Water And Nitrogen Behavior And Their Effects On Yield And Sustainability Of Wheat-Maize Double Cropping System

A join simulation model about soil water and nitrogen dynamics (behavior) was established with I think simulation software which the simulation model based on the field experiment comprise seven submodels weather date generator, phenology submodel, biomass production submodel, dry matter participation submodel, water balance submodel, nitrogen balance submodel and nitrogen absorption and partition submodel. As the main factors to crop production, water and nitrogen was added to crop growth simulation. Water and nitrogen behaviors in this system involve transformation, transport and the crop root uptake. Being based upon the theory of crop growth and development and dynamic function of water and nitrogen transference, the join simulation model which join the crop character and dynamic of soil water and nitrogen together can show the correlation between field and water nitrogen, yield and nitrogen also can show the use efficiency of water and nitrogen in field. Considering soil NO; as soil solute, employing the convective-dispersive model, this paper presented a simulation submodel of nitrogen behavior in soil and crop. The coefficients of soil nitrogen transformations and transport was amended by soil moisture and soil temperature. The join simulation model was tested with the experimented data of winter wheat - summer maize double cropping system in xinji. The results showed the model is generally valid, so it can be used for simulating the relate items. The WUE, NYE, yield; water drainage and nitrogen leaching amount which can be predicted by the model was considered as indicators of agricultural sustainabledevelopment. In order to make agricultural production ecologically sound, economically profitable and socially responsible, we can use the successful simulation model to predict or control agricultural production.