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五月寒
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五月寒
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农学
五月寒
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chilling in May
五月寒
早稻孕穗扬花期间,由于花粉母细胞减数分裂期对环境气象因子十分敏感,日平均气温连续3天以上降到20℃以下,或连续3天最低气温低于15℃,使水稻花器发育不良、花粉败育,空壳率增加,最终影响产量的一种灾害。多出现在小满到芒种农历五月的梅雨季节,又称梅雨寒[注]。
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