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问题的提出近年来,为了解决水资源的供需矛盾,人们在建设节水型农业方面,做了许多试验研究和推广工作。这些工作,多是从改进灌水技术和优化灌溉制度两方面来研究节水和提高单方水的增产效益的。而地膜覆盖栽培技术的应用,为灌溉农业开辟了新的节水途径。地膜覆盖栽培,就是用一层很薄的塑料薄膜覆盖在高畦或者高垄上,在薄膜上按照需要的行株距打孔栽植作物的一种方法。二十世纪中叶,世界上一些发达国家已经应用这种方法。日本国,四十
Problems raised In recent years, in order to solve the contradiction between supply and demand of water resources, people in building water-saving agriculture, has done a lot of experimental research and promotion. These efforts are mainly from the improvement of irrigation technology and optimize the irrigation system to study two aspects of water-saving and increase the yield of unilateral water. The application of plastic film mulching technology has opened up a new water saving way for irrigated agriculture. Film mulching is a method of perforating a crop with a thin layer of plastic film over a ridge or ridge with the desired line spacing on the film. By the middle of the twentieth century, some developed countries in the world have applied this method. Japan, forty