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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素追施比率的关系田间试验。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，充分发挥水肥的效益
Field experiments were conducted in the Shangqiu experimental area of the Yellow River, Huainan, Henan and eastern plains for three years to study the relationship between soil water content and top-dressing 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 farming (winter wheat growth period of 200 ~ 260mm), the appropriate chase N rate of 25% or 0 (all bottom); medium water supply conditions (watering throughout the growth period more than 50% of the chase) N ratio is appropriate. Only in this way can improve water use efficiency and fertilizer utilization, give full play to the benefits of water and fertilizer