1 玉米缺粒的原因1.1 玉米缺粒主要表现为全穗一侧缺粒、穗间缺粒、寥寥几粒正常粒散布果穗上,少数缺粒分布在正常粒之间。1.2 缺粒的原因是子粒败育,子粒败育主要发生在两个时期。第一期败育发生在子粒胚胎形成期(授粉后10～15d)成熟时为膜状或褐色颗粒,干重为正常子粒的5%以下;第二 A lack of corn causes 1.1 corn grains mainly on the side of the lack of grain on the whole spike, missing grains between spikes, a few grains of normal grains scattered on the ear, a small number of missing grains distributed between normal grains. 1.2 The reason for the lack of grain is the abortion of the grain and the abortion of the grain occurs mainly in two periods. The first abortion occurred in the formation of embryonic embryos (pollination 10 ~ 15d) mature when the film or brown particles, the dry weight of less than 5% of normal grains; the second