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一、追肥追拔节肥和挑旗肥,应掌握前重后轻的原则,即拨节期的追肥量应占追肥总量的2/3,起到增花增粒的作用;挑旗期的追肥量应占追肥总量的1/3,可起到保花保粒、减少小花退化、增加粒重、延长叶片寿命、防止早衰等作用。拔节肥一般在高粱12～13片叶时追施。亩追硝铵15公斤;挑旗肥一般在7月22～27日追施,每亩追硝铵7公斤。如果肥少,可在拔节期追1次肥。追肥时一定要掌握好追肥量和追肥时间,如
I. Top-dressing fertilizer and flag-bearing fertilizer should be followed before and after the principle should be grasped, that is, the allocation of seasonal fertilizer should account for 2/3 of the total amount of top dressing, play a role in increasing flowers by grain; Topdressing should account for the total amount of topdressing 1/3, can play Paul flower grain, reducing floret degradation, increase grain weight, extend leaf life, prevent premature aging and so on. Jointing fertilizer generally sorghum 12 to 13 leaves top dressing. Acre ammonium 15 kg acreage; the flag is generally carried out in July 22 to 27 top-dressing, ammonium acupuncture per acre 7 kg. If less fat, you can chase a jointing fertilizer. Top dressing must master the amount of fertilizer and dressing time, such as