玉米是辽宁省主栽作物,每年种植面积近133万hm2,占粮食作物面积的50％左右。田间草害一直是困扰玉米生产的重要问题。自20世纪90年代中、后期以来,以玉米为主的旱田化学除草得到了迅速发展。据调查,应用的除草剂品种多达几十种,其中大多为已使用数年的以阿特拉津、乙草胺、2,4-D丁酯等为主的混剂,农民俗称”老三样”。但也出现了部分高效、持效期适中、杀草谱广的除草剂新品种,本研究涉及的旱锄便是其中之一。39％噻磺·乙可湿性粉剂（商品名旱锄,下称）是由安徽丰乐农化有限责任公司新近研制开发的除草剂。为考察其在玉米田的应用效果及对作物安全性, Corn is the main crop in Liaoning Province, with annual planting area of ​​nearly 1.33 million hm2, accounting for about 50% of the area of ​​food crops. Planting grass in the field has been an important issue that plagues corn production. Since the middle and late 1990s, the chemical weed control on dryland mainly corn has been rapidly developed. According to the survey, there are dozens of varieties of herbicides used, most of which have been used for several years with atrazine, acetochlor, 2,4-D butyl ester-based mixture, farmers commonly known as “old Three kind. ” However, some new types of herbicide with high efficiency, moderate holding period and broad spectrum of herbicide have also emerged. The drought hoe involved in this study is one of them. 39% thio-B · wettable powder (trade name dry hoe, hereinafter referred to) is a newly developed herbicide by Anhui Fengle Agrochemical Co., Ltd. In order to investigate its application effect in corn field and crop safety,