湖南省是一个水稻大省，常年水稻种植面积在６５００万亩左右，据调查，其中二级以上杂草危害面积占５０％，杂草危害损失率高达１３．４％，每年因杂草危害造成的稻谷减产达１０亿多ｋｇ。近年来，随着我省农村经济的发展壮大，以及大量劳动力外流，水田化学除草技术以其功效? Hunan Province is a big rice province with a perennial rice planting area of ​​about 65 million mu. According to the survey, more than 50% of the weeds are covered by secondary weeds, and the loss rate of weeds is as high as 13.4%. The annual damage caused by weeds Of the paddy cut more than 1 billion kg. In recent years, with the development and growth of rural economy in our province, as well as a large number of outflow of labor force, the effectiveness of paddy field chemical weeding technology for its effectiveness?