在高度水、肥、密的农业技术措施下,控制小麦倒伏是获得丰收的关鍵問題。造成倒伏的原因虽然很多,但由于肥料施用不当和不及时,特别是不合理的施用氮肥而造成严重倒伏还是普遍存在的。因此近来有些人对氮肥的施用产生不少顾虑,为免倒伏,在春季麦田中不施或少施氮肥。但氮肥又是小麦重要营养元素之一,不施或少施氮肥即会影响产量,所以氮肥什么时 Controlling wheat lodging is a key issue for achieving good harvests under highly water, fertilizer and dense agricultural techniques. Although many causes of lodging, but due to improper and improper application of fertilizer, especially unreasonable application of nitrogen fertilizer and causing serious lodging is still widespread. Therefore, some people recently have a lot of concerns about the application of nitrogen fertilizer. In order to avoid lodging, no or little nitrogen fertilizer is applied in spring wheat fields. However, nitrogen is one of the important nutrient elements of wheat, no fertilizer or less nitrogen will affect the yield, so when the nitrogen fertilizer