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洋葱属植株低温感应性蔬菜，商品利用主要为其鳞茎。在生产中经常遇到洋葱鳞茎未膨大就先期抽薹的现象，导致商品性降低。为了防止这种现象的发生，应采取如下措施：１选择适宜品种华北地区栽培应选用冬性极强的品种，如西安红皮、早生丸３号、早生泉州等。２适时播种华北...
Onion plants low-temperature-sensitive vegetables, the main product for its bulbs. Often encountered in the production of onion bulb is not swollen on the pre-bolting phenomenon, leading to reduced product. In order to prevent the occurrence of this phenomenon, the following measures should be taken: 1 Select the appropriate varieties of cultivated in North China should use very strong winter varieties, such as Xi’an red skin, early Health Maru 3, early Quanzhou and so on. 2 timely sowing North China ...