在施用底肥、口肥的基础上,适时巧追是提高玉米、高粱产量的重要措施。特别是底肥施得少的地,更要及时追肥。从玉米、高粱的需肥特性看,苗期生长量不大,需肥较少,宜控苗促壮,一般依靠基肥和少量口肥即可。从拔节开始,茎叶生长加快,雌雄穗开始分化,需肥量也显著增加,需要适时适量追肥。孕穗、抽穗期是决定果穗大小,粒数多少的关键时期,也是需肥需水最多的时期,宜在抽穗前多施穗肥。开花授粉前后,如有脱肥现 In the application of base fertilizer, mouth fat, based on timely clever catch is to improve corn, sorghum yield an important measure. In particular, at the end of fertilizer, but also to timely top-dressing. From the corn, sorghum need fertilizer characteristics, seedling growth is small, less fertilizer, should be controlled Miaoshuangzhuang, generally rely on basal and a small amount of manure can be. From the beginning of the jointing, stem and leaf growth accelerated, male and female began to differentiate the need to significantly increase the amount of fertilizer needed appropriate timely top dressing. Booting, heading date is to determine the size of the ear, the number of grain-critical period, but also the period of most fertilizer and water needs, should be more before heading panicle fertilizer. Before and after flowering pollination, if there is off-fat