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

试验研究不同灌溉畦长对灌水量、灌水均匀度与土壤NO3--N分布的影响。结果表明,在农民习惯灌水条件下,短畦处理(90m)灌水量为102mm,而长畦处理(180m)灌水量为132mm,且灌水明显增加了长畦处理田块水分、养分的空间变异。长畦处理比短畦处理多损失44mm灌溉水,N素损失增加20kg/hm2。在农民习惯的大肥大水条件下,由灌溉畦长引起的水肥田块空间变异未对冬小麦产量造成明显影响。但缩短畦长是推广应用节水节肥优化生产体系的首要措施。

Effect of different border lengths on the irrigation homogeneity and soil nitrat e-N distribution on wheat field

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.