洋葱,维吾尔人叫“皮芽孜”,是新疆哈密地区农民致富的经济作物之一。但由于洋葱田杂草危害日趋严重,已成为扩大种植面积、提高产量和品质的最大障碍。 (一) 洋葱田杂草的种类和危害哈密地区洋葱田的杂草有野燕麦、稗、狗尾草、金色狗尾草、虎尾草、马唐、牛筋草、看麦娘、芦苇、灰绿藜、藜、灰绿碱蓬、扁蓄、地肤、苍耳、蒺藜、田旋花、苦苣菜、刺儿菜等19种。由于洋葱苗期生长缓慢,从播种到三叶期需50天以上,故杂草发生量大(每平方米达 Onion, a Uyghur called “Piyazi”, is one of the cash crops that farmers in Hami in Xinjiang have become wealthier. However, as weeds in onion fields become more and more endangered, it has become the biggest obstacle to expanding planting area, increasing yield and quality. (I) Types and Harms of Weeds in Onion Fields Weeds in the onion fields in Hami Region include wild oats, barnyard grass, green foxtail, golden foxtail, chloris, crabgrass, goosegrass, madder, reed, Phyllostachys glycyrrhizae, flat storage, skin, Xanthium, Tribulus terrestris, Convolvulaceae, Sonchus absinthium, Cicadas and other 19 species. Due to the slow growth of onion seedling stage, from sowing to three-leaf stage need more than 50 days, so the occurrence of large weeds (up to per square meter