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大葱是雌雄同花,异花授粉植物,主要靠昆虫传粉。近年来,由于田间和果园大量使用杀虫药,至使田间蜜蜂和其它昆虫数量大大减少,再加之在大葱花期常常遇到连续几天的干热风,使大葱得不到充分的授粉,一般亩产葱籽仅15—25公斤左右。为了弥补自然授粉不足和减轻不良气候的危害,需要采取以下几项措施。
Scallions are monoecious, cross-pollinated plants, mainly by insect pollination. In recent years, due to extensive use of insecticides in fields and orchards, the number of bees and other insects in the field has been greatly reduced. Moreover, the dry green hot wind frequently encountered in the flowering stage of verdure often results in the green onions not being sufficiently pollinated, Produce onion seeds only 15-25 kg or so. In order to make up for the lack of natural pollination and mitigate the harmful effects of bad weather, the following measures need to be taken.