氮素对冬小麦产量的亏缺及补偿效应

通过盆栽试验研究了正常灌水条件下，不同生育阶段氮素亏缺对冬小麦生长发育的影响。结果表明，越冬期和拔节期氮素亏缺对冬小麦的产量影响最大，后期缺氮对其产量的影响最小。总的来看，冬小麦对氮素的亏缺敏感期在越冬期和拔节期，尤以拔节期更为迫切；补偿有效期在拔节期。

Effects of nitrogen stress and complement on the yield and its component in winter wheat

The pot experiment was conducted to study effects of nitrogen stress stage on the yield and its component in winter wheat under irrigated conditions. The results indicated that nitrogen stress at tillering and turn green-jointing stage could reduce the yield of winter wheat, but had no effect at late stage;the spikelet bearing number and the 1000-grain-weight were reduced by nitrogen stress at tillering stage and turn green-jointing stage respectively,but nitrogen stress at different stage had no significant effects on grain number per spike and spike length. Over all,the sensitive stage of winter wheat responses to nitrogen stress is tillering and turn green-jointing stage,the compensative stage is turn green-jointing stage.