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玉米中后期主要指穗期(拔节至开花)和花粒期(开花至成熟)2个阶段,穗期阶段是由营养生长转向营养生长与生殖生长并进的时期,一般历时27—30天。其生育特点是根、茎(节间)、叶迅速生长的同时,雄雌穗迅速分化,是玉米一生中生长发育最旺盛和决定玉米穗数、穗子大小的阶段,也是田间管理最关键的时期。这一阶段的管理目标是促秆壮穗,防止倒伏,防治病虫害,以
The middle and late stages of maize mainly refer to the two stages from the heading stage (from jointing to flowering) and the flowering stage (flowering to maturity). The growth stage of vegetative growth to vegetative growth and reproductive growth in panicle stage usually takes 27-30 days. Its fertility is characterized by roots, stems (internodes), rapid growth of leaves at the same time, male and female rapid differentiation is the most vigorous growth and development of maize throughout the life and the determination of the number of ears, ear size stage, but also the most critical period of field management . Management objectives at this stage are to promote strong spikes, prevent lodging and prevent pests and diseases