二甲四氯成本低,除草效果好,是本地晚稻田良性除草剂,但常因使用不当而造成药害。为此,我们于1988—1991年连续4年在二甲四氯使用技术方面进行了大量的试验示范,总结出了行之有效的避免药害的方法,并在全县大面积推广应用,效果很好。其技术措施如下:一、提前施药改变二甲四氯在水稻分蘖末期施药的传统习惯。据多年、多点的试验示范结果表明,晚稻插后5—7天为施药的最佳时期,这 Methyldichloride low cost, good weeding effect, is a local late rice fields benign herbicides, but often due to improper use caused by injury. To this end, we carried out a large number of experiments and demonstrations on the use of DMTC for four consecutive years from 1988 to 1991, summarized the effective ways to avoid injury and applied them widely in the whole county well. The technical measures are as follows: First, advance application of pesticides to change the traditional application of MCPA at the end of rice tillering. According to many years, more pilot demonstration results show that late rice 5-7 days after the plug is the best period of application, which