论文部分内容阅读
我县棉田化学除草在七十年代就开始应用,到现在已发展到年平均4kha 以上,占棉田面积70%左右。无论是集中棉区,还是分散棉区,不管是一熟棉田,还是两熟棉田,两膜早棉和露地直播棉,均采用化学除
Our county cotton field chemical weeding began application in the seventies, until now has been developed to an average annual 4kha, accounting for about 70% of the cotton field. Whether it is concentrated cotton area, or scattered cotton area, whether it is a cooked cotton field, or two ripe cotton fields, two films of early cotton and opencast cotton, are used in addition to chemical