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一、播种太深播种过浅不易出苗,过深会出现苗弱、苗黄,播深应控制在3~5厘米。二、间苗、定苗不及时玉米出苗后,应在玉米3~4片叶时进行间苗,6~7片叶时定苗,避免幼苗拥挤,互相争肥、争水、争光,形成弱苗、病苗、黄苗。三、浇水不足玉米播种前或播种后浇水不足,种子得不到充足的水分,进而影响正常发芽出苗,出土时间过长造成弱苗、苗期发黄。
First, sowing too shallow sowing is not easy to emerge, too weak will appear weak, seedling yellow, sowing depth should be controlled at 3 to 5 cm. Second, the seedlings, Dingmiao not timely after emergence of corn, corn should be 3 to 4 leaves when the Miao Miao, 6 to 7 leaves Dingmiao to avoid crowded seedlings, fight each other to fight water, Zheng Guang, the formation of weak, sick vaccine , Yellow seedlings. Third, lack of water Before or after planting sowing corn insufficient watering, the seeds are not sufficient water, thus affecting the normal emergence of germination, unearthed for a long time caused by weak seedlings, seedling yellow.