杂草是农业生产中的一大危害。千百年来我国勤劳智慧的农民采用各种农业生产措施来消灭杂草，积累了丰富的经验．近年来随着经济建设的改革开放，农业技术现代化的逢勃发展，工业对农业支援的增强，机械化除草和化学除草迅速地发展起来。本试验为了探索夏播棉花、玉米、谷子田 Weeds are a major hazard in agricultural production. For thousands of years, the industrious and wise peasants in our country have used various agricultural measures to eliminate weeds and have accumulated rich experience. In recent years, with the reform and opening up of economic construction, the vigorous development of agricultural technology modernization, the enhancement of industrial support for agriculture, the rapid development of mechanized weeding and chemical weeding. This experiment in order to explore the summer sow cotton, corn, millet fields