一.引言“莠”就是人們不需要它們生长的植物(包括陆生,水生草本及木本植物)。化学除莠剂就是消灭莠的化学药剂。莠对农工业,交通运輸,家畜及人类健康都带来很大的危害,尤其是对农业生产的影响更为严重,統計资料表明它是农作物生物災害中影响最大的一个因素(表1)。 I. INTRODUCTION “Ammo” is a plant (including terrestrial, aquatic and woody plants) that people do not need for their growth. Chemical herbicides are chemical agents that eliminate the ametrine. Ammonia is a serious hazard to the agro-industry, transportation, domestic animals and human health. In particular, the impact on agricultural production is even more serious. Statistics show that it is the most influential factor in crop biological disasters (Table 1) .