大葱播种后出苗慢,小苗叶小,生长慢,易受杂草危害,杂草先出土影响大葱出苗,然后在整个苗期与大葱苗争水、争肥、争光,严重时造成葱苗大面积死亡。其防除技术如下:播前彻底清除田间杂草上茬作物管理期间,加强中耕除草,采用人工除草和化学除草相结合,特别注意杂草种子尚未成熟前清除田间地头杂草,进一步减少有可能进入 Green onions after emergence of seeding slow, small seedling leaves, slow growth, vulnerable to weeds, weeds first unearthed the emergence of green onions, and then in the whole seedling water dispute with green onions, fight fat, win glory, caused by a large area death. The prevention and control technology is as follows: Before sowing to remove field weeds in the stubble crop management period, strengthen the cultivation and weeding, the combination of artificial weeding and chemical weeding, with special attention to weed seeds before the field cleared to remove weeds, to further reduce the possibility of entering