1土壤选择选用近两年内没有种过葱蒜类作物的地块,洋葱根层集中在20cm以上的表土中,无主根,无根毛,吸收能力弱,因此要求在疏松肥沃,保水保肥能力强的壤土或沙壤地上种植。幼苗不耐盐碱,出苗后生长缓慢,土壤pH8.0～8.3,有机质含量在1%以上,并且不和葱蒜类植物重茬。2整地种植洋葱的土地要求秋翻冬灌。前茬作物收获后, 1 Soil selection In the past two years did not plant all kinds of onion and garlic plots, onion root layer concentrated in more than 20cm of the topsoil, no main root, root hairless, weak absorption capacity, therefore required in the loose and fertile, water and fertilizer ability Of loam or sandy soils planted on the ground. Seedlings do not tolerate salt and alkali, slow growth after emergence, soil pH8.0 ~ 8.3, organic matter content of more than 1%, and not with the onion and garlic stubble. 2 site preparation of onions planting land requirements fall winter irrigation. After the harvest of the former crop,