玉米从抽雄至成熟这一段时间为花粒期。这个时期生育特点是经过开花、授精后进入子粒产量形成阶段。田间管理的任务是:保护叶片不损伤、不早衰,争取粒多、粒重,达到丰产。一、花粒期对环境条件的要求 1.温度。玉米抽穗开花期要求日平均温度为26-27℃左右,低于18℃或高于35℃均不能开花。高温干燥的条件会使花粉粒失水干瘪而 Corn from tasseling to mature during this period of pollen period. Fertility during this period is characterized by flowering, fertilization into the grain yield formation stage. Field management tasks are: to protect the leaves do not damage, premature aging, for more grain, grain weight, to achieve high yield. First, the requirements of the environmental conditions of the flower stage 1. Temperature. Maize heading and flowering requires daily average temperature of about 26-27 ℃, less than 18 ℃ or above 35 ℃ are not flowering. High-temperature drying conditions pollen grains will dehydration dry