紫皮洋葱良种生产一般都沿用传统的成株采种法,这种采种法每一个采种周期跨度3年,历时23个月,不仅时间长,而且葱头贮存任务大,种子产量低,影响繁种的经济收益。采用二级繁种制度下的洋葱小种株采种法,使采种周期缩短为12个月,且种子田间生产力不降低,可在紫皮洋葱良种生产中应用。 1 播种育苗 1.1 育苗地磷钾肥要足。选择土质疏松、肥沃、不重茬的耕地,施入腐熟有机肥10kg/m~2、过磷酸钙 Purple seed production of onion species generally follow the traditional method of adult seed collection, the seed mining method for each seedling cycle span of 3 years, which lasted 23 months, not only a long time, and onion storage tasks, low seed yield, affecting the breeding species Economy Profit. Using the method of seed multiplication of onion small seed under the second-grade breeding system, the seed-planting cycle was shortened to 12 months, and the productivity of seed in the field did not decrease. It could be applied in the production of purple onion onions. 1 sowing seedlings 1.1 seedling to phosphorus and potassium to be enough. Select the soil loose, fertile, not cropping of arable land, applied to decomposed organic fertilizer 10kg / m ~ 2, superphosphate