Abstract
For the water-diversion irrigation area which relies mainly on canal irrigation but easily results in secondary salinization, it is an imperative issue to set up a rational irrigation and drainage system. This paper, based on the principle of both water-salt balance and water amount balance, studies the irrigation and drainage system and the method of water saving and salinization prevention, and proposes an easy and practical method. The system and method are applied and tested in a typical irrigation area. The study is of great value to the design of the gravity irrigation and drainage area and the transformation of the secondary salinization irrigation area.
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