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我国北方地区的棚室作物,在寒冷和短日照的冬季,时常遭受寒流侵袭而发生冻害。特别是12月-2月份,寒流频繁发生,降温幅度大,棚室作物极易发生冻害。辣椒、黄瓜在室温降至12℃,西红柿降至10℃,西瓜、茄子降至5℃便易发生冻害。冻害发生后,若不科学补救,就会造成严重损失:轻者,生长停滞,植株黄化,即便恢复生长,也是植株矮小、叶小、节短、果实小而畸形多,产量和品质降低;
Greenhouse crops in the northern part of our country suffer from frost damage during cold and short sunshine in the winter and are often affected by cold currents. Especially in December-February, frequent occurrence of cold flow, large temperature drop, greenhouse crops prone to frost damage. Pepper, cucumber down to 12 ℃ at room temperature, tomatoes reduced to 10 ℃, watermelon, eggplant down to 5 ℃ prone to frost damage. Frost damage, if not scientific remedy, it will cause serious losses: light, growth stagnation, plant yellow, even if the restoration of growth, but also short plants, leaves small, short, small fruit and deformity, lower yield and quality;