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近年美国发明了一项农业专利“双层灌溉排水系统”,可使土壤一年四季保持理想水分,作物产量可因之提高一倍.这种系统的结构是:在作物地表下埋置两层深度不同的瓦管管道,一层埋在地表下0.5～0.6米深处,作灌溉用;另一层埋在地表下0.9～1.2米深处,作排水用.这两层管系各有自己的闸门控制水流.打开排水闸门时,水从农田土壤中排入集水坑,然后从集水坑抽入水库;关闭排水闸门、打开灌溉闸门时,可将水库中的水抽入灌溉管系向土壤进行灌溉.这样,通过排水与灌溉的循环,就可保持恒定的地下水位,使作物在整个生长期都有恒定的水分供应.此外,还有如下附加好处:①管道中不易产生泥沙沉积,水分及养料的损失很小;②可改善水库水质,例如某水库含氮量高达100PPm,将水通过这种系统循环后因作物的脱氮作用使水库中氮含量降到2.5PPm;③便于作物的液体施肥.
In recent years, the United States invented an agricultural patent “double irrigation drainage system”, can make the soil maintain ideal moisture year round, crop yield can be doubled.The structure of this system is: buried in the crop two layers Depth of different tile pipe, buried in the ground floor 0.5 to 0.6 meters deep for irrigation purposes; another layer buried in the depths of 0.9 to 1.2 meters below the surface for drainage purposes. The two pipe system has its own Of the gate to control the flow of water .When the drainage gate is opened, water is drained from the soil in the farm into a sump and then sucked into the reservoir from the sump; when the drainage gate is closed and the irrigation gate is opened, the water in the reservoir can be drawn into the irrigation pipe Irrigation to the soil so that a constant water table can be maintained through the drainage and irrigation cycles and the crop has a constant moisture supply throughout the growing season as well as the additional benefits of: Sediment, water and nutrients loss is small; ② can improve the water quality of reservoirs, for example, a reservoir of nitrogen up to 100PPm, the water circulation through this system due to crop nitrogen removal so that the reservoir to reduce the nitrogen content of 2.5PPm; Liquid fertilizers for crops.