土壤水分与氮素追施比率的关系

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

The Relationship between Soil Moisture and N top Application Rate

The field experiments with winter wheat, conducted in ShangQiu test area of Huanghuai East Henan Plain for three years,show that a obvious interaction exists between the soil moisture and N top application rate in winter wheat. The different soil moisture conditions require the corresponding N top application rate. The suitable rate of N top application is 25% or 0% (full use in base)under dry farming condition(200～260 mm of precipitation amount during the growth period of winter wheat, and 50% under middle irrigation condition(irrigated over two time in whole growth period),which can increase the efficiency of moisture and fertilizer application in full.