[Background]Water is the main limiting factor of plant growth and ecological restoration in vegetation afforestation in arid area.The inefficient use of soil moisture will lead to the waste of soil water in vegetation construction,soil dry layer,low ecological efficiency and poor vegetation growth.The application of water-retaining agents in arid zones can compensate for these shortcomings,and the best use of it for different plants needs to be studied.[Methods] In order to study the optimal amount of water...