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目前,京郊蔬菜生产已经入春茬育苗阶段,一场突如其来的大雪将京郊气温又降回0℃,此次较强的寒潮过程,也是所谓的“倒春寒”。“倒春寒”来临时,往往伴有风、雨、雪,它对春季保护地果菜类蔬菜生产、育苗、及露地早熟蔬菜生产,都能产生不同程度的冷害,从而造成烂根、死苗、落花落果以及急性萎蔫等症状,给农业生产带来损失。如防范不力,还会造成倒棚、棚膜被吹掀、刮破、棚架折断,导致菜苗冻坏冻死等现象。因此,对于春季低温冷害,需加以警惕,并及早作好预防工作。
At present, the vegetable production in the suburbs of Beijing has entered the nursery stage of spring cropping. A sudden heavy snowfall will return the temperature in the suburbs of Beijing to 0 ℃ again. This strong cold wave process is also called “late spring coldness.” When coming in late spring, it is often accompanied by wind, rain and snow. It can produce chilling injury to varying degrees due to the production of spring vegetables, seedlings, and open-field vegetables in spring, resulting in rotten roots and dead seedlings , Falling flowers and fruit and other symptoms of acute wilting, bring losses to agricultural production. As a precautionary measure, but also cause inverted shed, shed film was blown lift, scrape, scaffolding broken, leading to frozen seedlings frostbite and so on. Therefore, we should be vigilant against the chilling injury in spring and make prevention work as early as possible.