常说的攻穗肥,一般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40～45天期间。此时正是玉米雌穗小穗分化盛期和进入小花分化的时期,是决定果穗大小、籽粒多少的关键时期,也是玉米需肥最多的时期。 Often said that the attack panicle, corn generally refers to a large bell mouth before a top dressing. For summer maize, about 40 to 45 days after sowing. At this point, it is the peak period of ear spikelet differentiation and the period of floret differentiation that determines the size of ear and the number of kernels. It is also the period when corn needs fertilizer most.