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北京市郊区生产葱头,历来是采用秋播、冬或春栽,夏收的方法,一般在7月初收获,少部分当时上市,大部分经晾晒、风干、码垛或装箱贮存,于8、9月蔬菜淡季供应市场。葱头在贮存期间易发芽,随贮存时间延长芽不断生长,使鳞茎逐渐变软,甚至失去商品价值,因而难于延长到冬春季节上市,每年冬、春季节北京市场供应的葱头,几乎都是从外省、市调进来的。
The production of onion in the suburbs of Beijing has always been the method of autumn planting, winter or spring planting and harvesting in summer. Harvesting is generally carried out in early July. A small number of the products were put on the market at the time and most of them were dried, air-dried, palletized or packed in containers, Monthly vegetable off-season supply market. Onion in the storage period is easy to germinate, with the extension of storage time buds continue to grow, the bulb gradually softened, or even lose the value of the goods, it is difficult to extend to the winter and spring market, every winter and spring supply of Beijing onions, almost all from Other provinces, municipalities come in.