8.苗期蹲苗蹲苗的主要作用就是控制基部茎节的旺长、促进根系发育,从而减轻倒伏的几率。蹲苗应在苗期进行。苗期可控大苗、促小苗,使幼苗整齐健壮。蹲苗的原则是“蹲黑不蹲黄,蹲肥不蹲瘦,蹲干不蹲湿”。试验表明:苗期控制浇水进行蹲苗的玉米,植株高度可下降10~30厘米,尤其是植株下部节间明显缩短,韧性增强;玉米根系增加3~6条/株,并且根系下扎较深,抗倒性明 8. seedling squat seedlings Dunmiao’s main role is to control the base of the node of the prosperous, promote root development, thereby reducing the risk of lodging. Squash seedlings should be carried out. Seedling controllable seedlings, and promote seedlings, the seedlings neat and tidy. The principle of squatting seedlings is “squatting black is not squatting yellow, squatting fat not squatting squat squat dry squatting wet ”. The results showed that the plant height of the maize with squatting seedlings could be reduced by 10-30 cm when watering at seedling stage, especially the internodes of lower plants were significantly shortened and their toughness was enhanced. The maize roots increased by 3 ~ 6 / plant, , Lodging resistance Ming