宁夏灌区春小麦生育期短,发育快,生产中素有“一次追施大头肥”的习惯。但在沙土地小麦生产实践中,由于土壤含有机质少,肥力低,保肥性能差,因而一次追施氮素化肥,中后期会出现脱肥早衰。近年来,西干渠灌区的一些国营农场已基本上用“分次追施接力肥”取代了“一次追施大头肥”,收到了良好的效益。 Ningxia irrigated spring wheat short growth period, rapid development, production known as “a top-dressing fertilizer” habit. However, in the practice of wheat production in sandy land, due to the small content of organic matter in the soil, low fertility and poor fertilizer-keeping performance, nitrogen fertilizer is topdressed at the first time. In recent years, some state-owned farms in the Xiqianqu Irrigation District have basically replaced the “one-time top-dressing fertilizer” with the “top-grade topdressing fertilizer” and received good benefits.