所谓孕穗肥,是指玉米进入大喇叭口期以前的一次追肥。就夏玉米而言,大约在播种后的38～42天左右时间。此时正是玉米雌穗小穗小花分化盛期,是决定果穗大小、籽粒多少的关键时期,也是玉米需肥的高峰期。因此,生产上应及时追好这遍肥,以促进雌穗小穗小花分化,达到穗大粒多之目的,为后期玉米高产打好基础。试验证明,及时追好孕穗肥,可使玉米增产 Booting so-called fat, refers to the corn into the big bell mouth before a top dressing. In terms of summer corn, about 38 to 42 days after sowing time. At this point is the ear of corn spikelets flower differentiation stage, is to determine the size of the ear, the number of kernel critical period, but also the peak of fertilizer to be corn. Therefore, the production should be chased this fertilizer in a timely manner to promote the spikelets of spikelets of ear differentiation, to achieve the purpose of spike large grain and lay the foundation for the latter part of high yield of corn. Test proved that timely recovery of booting spike, corn yield