摘要
1 INTRODUCTION Herbicides are an essential pillar in modern agricultural practice.They are used to selectively reduce the growth of weeds in crops and natural environments.Early weed mitigating chemicals date back to Roman times and include substances as simple as table salt,sulfuric acid and carbon bisulfide.However,these were non-selective,required high application rates and could be toxic not only to the target weeds but to other plants and to animals.The first major advance in the development of tailored herbicides began in the mid 1940s with the development of the first organic growth regulators such as 2,4 dichlorophenoxyacetic acid(2,4-D)[1].The next major advance came in the 1970s with the discovery of glyphosate[2],marketed as Roundup,a herbicide that is routinely used to eradicate broad leaf weeds and grasses.
