| According to Jensen water-production function model of crops,the optimal irrigation schedules for winter wheat,cotton and summer maize have been established by means of dynamic programming.The visual program interface has been developed,and the suitable optimal irrigation schedule could be made for different regions as long as the related parameters(field water capacity,initial soil moisture,soil bulk density,allocated water supply,potential evapotranspiration of crops at different stages,effective precipitation at various stages in different hydrological years,and the planned wetted depth at each stage) are input.Exemplary computation was conducted for Jinzhong and Linfen areas in Shanxi,showing that the water consumption of these three foregoing crops may be saved by 9%,7% and 3% respectively,compared with the conventional irrigation method.Under the condition of water shortage,the system might supervise the allocation of water amount on the basis of time so as to minimize the reduction of output,and the quantity of yield reduction under optimal irrigation schedule could be forecasted. |