玉米是喜肥作物,一生都要求供给充足的氮素营养和磷肥,但最关键的时期是在抽雄穗前(大喇叭口期)进入拔节以后。特别是抽雄前,这是玉米小穗和小花分化盛期,也是决定果穗大小、结粒多少的关键时期,此时缺水就形成卡脖旱。必须水肥齐攻,即所谓攻穗肥。如玉米一生只追一 Corn is a hi-fat crop that requires adequate supply of nitrogen and phosphate fertilizer all its life, but the most crucial period is after the tassel (large bell mouth) enters jointing. In particular, before tasseling, this is the peak of differentiation of maize spikelets and florets, but also determines the size of the ear, the number of grains critical period, when the water shortage to form a card neck drought. Qi water and fertilizer must attack, the so-called attack spike fertilizer. Such as corn chasing only one life