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1 原因分析玉米属于异花授粉作物,主要靠风力传粉。它的生长发育经历了种子萌动、发芽、长根、出苗、长叶、拔节、雌雄幼穗分化、抽穗、开花吐丝、授粉受精、灌浆、成熟等过程。拔节期到抽穗期是营养生长与生殖生长并进期,从抽穗到灌浆阶段是开花受精和以子粒形成为中心的生殖生长期,这一阶段是产量形成的关键时期。从拔节期到灌浆期遭遇高温、干旱、低湿、低温、花期多雨、营养缺乏、
1 reason analysis Corn is cross-pollination crops, mainly by wind pollination. Its growth and development experienced seed germination, germination, rooting, emergence, long leaves, jointing, male and female spike differentiation, heading, flowering silking, pollination and fertilization, filling, maturation and other processes. From jointing stage to heading stage is vegetative and reproductive growth and advancing stage. From heading stage to filling stage is flowering and fertilization and seed formation as the center of reproductive growth stage, this stage is the key period of yield formation. From the jointing stage to the filling stage encountered high temperature, drought, low humidity, low temperature, flowering rainy, lack of nutrition,