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圆葱(洋葱)留种周期长,成本高,在长江中、下游地区通常采用秋播三年采种法,即在第一年秋季播种育苗,大田种植;次年形成商品葱头,选择母鳞茎秋季种植,第三年春季抽谷开花,夏季采收种子。如用秋播二年采种法,第一年秋季提前播种(较正常葱头生产的播种期早半个月左右,杭州地区是在
Onion (onion) to stay a long cycle, high cost, in the Yangtze River, the downstream region is usually used three-year autumn planting method, that is, the first year sow seedlings planted in autumn, field planting; Planting, the third spring bloom Valley flowering, summer harvest seeds. Such as the use of autumn planting method for two years, the first year of planting in advance of the fall (compared with the normal onion production sowing about half an month earlier, Hangzhou is