自1959年2月设计成功硫磺烟剂[1]以来,已经过了一年的时间。今年以来,由于硫磺烟剂日益为群众所重视,在陕西省农林厅赵厅长及中农部植保局高局长的直接关怀和督促下,我们在1960年五月份进行了一系列的大田放烟试验,目的在于观测烟云的大田流动规律并测定大田药效。 It has been a year since the successful design of sulfur smoke and tobacco [1] in February 1959. Since the beginning of this year, due to the increasing emphasis on sulfur smoke and tobacco products, under the direct care and supervision of Director Zhao of Shaanxi Provincial Department of Agriculture and Forestry and director of the Bureau of Plant Protection of the Ministry of Agriculture, we carried out a series of experiments on field emission of tobacco in May 1960 , The purpose is to observe the law of field flow of cloud of smoke and determine field efficacy.