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在黄淮豫东平原商丘试验区进行了三年冬小麦土壤水分与Ｎ素追施比率关系田间试验。结果表明：冬小麦的土壤水分和追Ｎ比率间存在明显的互作效应，不同土壤水分条件要求与之相适宜的追Ｎ比率。在旱作条件下（冬小麦生育期降雨２００～２６０ｍｍ），适宜的追Ｎ比率为２５％或０（全部底施）；中等以上供水条件（全生育期浇水二次以上），以５０％的追Ｎ比率为宜。只有如此才能提高水分利用效率和肥料利用率，充分发挥水肥的利用效益
Field experiments were conducted in the Shangqiu experimental area of the Yellow River, Huainan and Yuhang Plain in the past three years for the relationship between soil moisture and topdressing N rate. The results showed that there was a significant interaction effect between soil water and chase N rate in winter wheat, and the suitable N recovery rate required by different soil moisture conditions. Under the conditions of dry cultivation (winter wheat growth period of 200 ~ 260mm), the appropriate chase N rate of 25% or 0 (all bottom); medium and above water supply conditions (watering throughout the growth period more than twice) to 50% N ratio is appropriate. Only in this way can improve water use efficiency and fertilizer utilization, give full play to the use efficiency of water and fertilizer