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随着棉花地膜栽培技术的广泛应用，棉田杂草的发生期相应提前，加之长期使用氟乐灵进行土壤封闭除草，棉田草相发生了演变，禾本科杂草种类和数量下降，阔叶草上升为优势种群，杂草发生密度增加，严重影响地膜棉花正常生长与发育。为寻求适宜的化学除草剂品种与配方，１９９８?
With the extensive application of cotton mulching techniques, the occurrence period of weeds in cotton fields was advanced correspondingly. Combined with the long-term use of trifluralin for closed-soil weed control, the evolution of cotton grass facies occurred. The species and quantity of weeds in weeds decreased and the broad-leaved grass rose As the dominant species, weed density increased, seriously affecting the normal growth and development of cotton membrane. In order to seek suitable varieties and formulations of chemical herbicides, 1998?