Effect of different border lengths on the irrigation homogeneity and soil nitrat e-N distribution on wheat field
不同灌溉畦长对麦田灌水均匀度与土壤硝态氮分布的影响

The effect of different border lengths on the irrigation quantity,irrigation homogeneity and soil nitrate-N distribution was studied.The results show that the irrigation amounts in the longer border(180m) and shorter border(90m) are 132mm and 102mm,respectively.And the spatial variabilities of water and N are enlarged by irrigation in the longer border.Compared to the shorter border,44mm irrigation water and 20kg/hm~2 N are lost in the longer border.Under conventional irrigation and N fertilization management condition,the spatial variabilities in the water and N do not affect the winter wheat grain yield because of excessive water and N input.Shortening the length of border is the firstline measure if popularizing the optimized production system with N fertilizer and water.