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南方雨量充沛,温度较高,有利于各类田间杂草的滋生,严重影响棉花的早生快发。特别是推广地膜覆盖栽培和营养钵育苗移栽后,由于膜内的生态因子更易诱发杂草生长,致使膜内“肥水长猛草”。有的把膜顶起,有的将膜穿破,迫使农户过早地揭开塑料薄膜,使“两膜”棉花不能发挥它应有的作用。我们地区植棉面积70万亩左右,从七十年代开始,就在直播的大田里试用过化学除草剂,取得了一定的效果。近几年来,由于地膜棉的面积逐年扩
The abundant rainfall and high temperature in the south are conducive to the breeding of weeds in all kinds of fields and seriously affect the quick early growth of cotton. In particular, the promotion of plastic film mulching cultivation and nutrition bowl seedling transplanting, the ecological factors within the film more likely to trigger weed growth, resulting in the membrane, “Fusarium longicorn.” Some put the film from the top, some pierced the film, forcing farmers to uncover the plastic film prematurely so that the “two film” cotton can not play its due role. In our area about 700000 acres of cotton, from the seventies onwards, in the field of direct broadcast of chemical herbicides, and achieved some results. In recent years, due to the area of cotton membrane expansion year by year