杂草是农业生产的一大灾害。据1979年资料,全国15亿亩耕地中,每年遭受草害3亿亩以上,减产粮食150亿斤。我区草害约使粮食每年减产1.5亿斤以上。除草常消耗大量劳动力,而效果只能达到30～70％。为此我们在1981～1983年对灌区杂草开展了大面积的、比较系统的调查研究,并在1982～1984年开展了以麦田为主的化学除草试验。先后在永宁、灵 Weeds are a major disaster in agricultural production. According to the information from 1979, among the 15 million mu of cultivated land in the country, grass mines are suffering more than 300 million mu each year and the output of grain is reduced by 15 billion jin. Grass-producing areas in our area will reduce the annual grain output by more than 150 million kilograms. Weeding often consume a lot of labor, and the effect can only reach 30 to 70%. To this end, we conducted a large-scale and systematic investigation of weeds in irrigated area from 1981 to 1983 and conducted chemical weed-controlling experiments mainly in wheat fields from 1982 to 1984. In Yongning, spirit