地膜覆盖栽培棉花,中后期应抓好以下管理措施:一、控旺长一般棉株主茎在开花初期,日增长量超过2.5厘米,即表现旺长;超过3厘米则为疯长。控制棉株旺长和疯长的方法是:第一,捏茎蹲苗。从上向下数第三片叶,轻捏叶下的主茎节间,使之发响,受伤出水,这样使输导组织受损,养分往顶端的运输受到障碍, The plastic film mulching cotton cultivation, the late management should do a good job: First, control the general growth of cotton Wang main cotton stems in early flowering, the daily growth of more than 2.5 cm, the performance of flourishing; more than 3 cm is soaring. The way to control the growth of cotton plants is long and crazy: first, pinch stem squat seedlings. From the top to the bottom of the third leaf, gently pinch the leaf under the main stem internation, so that the sound, hurt the water, so that the guiding tissue damage, nutrients to the top of the transport barriers,