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我省冬季气候寒冷,春秋季气温变化剧烈,露地苗木越冬时易遭受寒流的侵袭和早晚霜的为害,使苗木发生冻害、冻拔和生理干旱,造成苗木大量死亡。因此,必须进行防寒。适用的方法有如下几种:1.熏烟:在预知发生霜害时,于当晚把半湿不干的稻草、麦秆、锯屑等材料堆在一起,每亩地均匀堆放6～10堆。在气温即将下降到0℃时,点燃材料堆,使其产生浓厚的烟幕,这样可阻止土温下降。
The winter climate in our province is cold, and the temperature in spring and autumn is changing drastically. When open-air seedlings are overwintering, they are vulnerable to the cold current and the damage of morning and evening frost, which causes frost damage, freeze-thaw and physiological drought of seedlings, resulting in a large number of seedlings dead. Therefore, it must be cold-proofed. The following are the applicable methods: 1. Fumigation: In anticipation of frost damage, put half-dried straw, straw, sawdust and other materials piled up on the night, and evenly stacked 6 to 10 hectares per mu. When the temperature is about to drop to 0 ° C, the material stack is ignited to produce a thick smoke screen, which prevents the soil temperature from decreasing.