由于个体生长差异及田间管理等因素影响，小麦成熟在个体间常不整齐一致，加上麦田杂草的影响，小麦机械收获的产量损失很大。据调查，机械收获的损失一般可达２２５～４５０kg／hm２，损失率高达３０％。笔者１９９９年开始在沙湾县商户地乡进行小麦应用２０％百草枯水剂（克 Due to individual growth differences and field management and other factors, the maturity of wheat is often not uniform among individuals, coupled with the impact of wheat weeds, wheat yield loss of mechanical harvesting is very large. According to the survey, the loss of mechanical harvesting generally up to 225 ~ 450kg / hm2, the loss rate as high as 30%. The author started in 1999 in Shawan County, commercial use of wheat to the countryside 20% paraquat agent (g