Real-time Irrigation Forecast Of Cotton With Drip Irrigation Under Plastic Mulch

Real-time forecast of irrigation is forecast of crop irrigation time and irrigation quota based on various kinds of date wich include: the lastest measured data and prediction data. A real-time irrigation schedule attains scientific irrigation in appropriate time and degree, which plays an very important role in water-saving for agriculture, agriculture modernization, and energy conservation society, and civilized and harmonious socialist new countryside.Some research show that study on the application of real-time forecast of irrigation is one of the critical and key to irrigation management system of dynamic planning water use and optimizing irrigation system.In the dissertation, the problems of the current irrigation forecasting methods are put forward. Considering the basic condition of our contury, a real-time forecast technique of irrigation based on evaporation from simple evaporator water surface is studied. So as to provide an forecasting method of irrigation which can be widely used in our country, at sme time, it will lay a theoretical foundation for development of irrigation forecast device.This paper mainly studied water consumption law for cotton with drip irrigation under mulch and the evaporation law for water surface in simple evaporator. Based on these established a relation between cotton water consumption and evaporation amount of water surface of simple evaporator. A real-time forecast method of irrigation schedule was obtain based on above study. The irrigation forecast of cotton below film drop irrigation by four different methods (water balance method, empirical formula model, exponential depletion model, forecast method of irrigation based on water surface evaporation).The research shows that the result of irrigation forecast by real-time forecast model based on the evaporation of water surface in simple evaporator which could well satisfy the demand of actual applied. Consequently, the evaporation of water can be used as an index of real-time forecast of irrigation. The application and popularization by this method is more easy than other methods, becase the parameter for calculation is very simple, and the calculation is relatively simple.