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在棉花苗期,出现大幅度降温、下霜、降水天气过程时,3 天、6 天棉苗,只要棉株上无水珠存留,在0~- 0.8℃气温下,持续3 小时,棉株未见受冻害现象;6 天的棉苗,气温为- 1.5~- 2.8℃时,持续2 小时,仍未见受冻害现象;若棉株上有水珠而结冰层,棉株抗冻性明显减弱,在0.4~- 0.8℃的气温下,持续2 小时,子叶受冻害株率为50% 。
Cotton seedlings, there have been substantial cooling, frost, precipitation weather process, 3 days, 6 days cotton seedlings, as long as the cotton plants without water retention, at 0 ~ - 0.8 ℃ temperature for 3 hours, Cotton plant has not seen the phenomenon of frost damage; 6-day cotton seedlings, the temperature is - 1.5 ~ - 2.8 ℃, for 2 hours, still not seen the phenomenon of frost damage; , The frost resistance of cotton plants was significantly weakened, and the cotyledon frost damage rate was 50% under the temperature of 0.4 ~ - 0.8 ℃ for 2 hours.