一、课题背景与研究过程 1、国内外化学除草发展动态一八九五年在法国、美国发现硫酸铜具有选择杀草作用,这就是农田化学除草的开端。一直到一九四二年内吸传导性除草剂2.4—D的发现在化学除草中开辟了一个新纪元。一九四五年二甲四氯除草剂问世,一九五七年敌稗的发现和一九六○年除草醚、杀草丹的出现,就形成了水田化学除草体系。 First, the background and research process 1, domestic and international chemical weeding development In 1895 in France, the United States found that copper sulfate has the role of selective grass, which is the beginning of chemical weed farming. The discovery of 2.4-D, a sucking herbicide, until 1942 opened the door to a new era of chemical weed control. The advent of MCPA in 1945, the discovery of propane and barnyard grass in 1957 and the emergence of weeding ethers and herbicides in 1960 led to the formation of paddy chemical weed control systems.