Stem and leaf growth: The optimum temperature for the growth of stems and leaves is 16 to 22 degrees; the daily average temperature exceeds 25 degrees, stems and leaves grow slowly; over 35 degrees or below 7 degrees, stems and leaves stop growing. When the temperature dropped to -1 degrees, the seedlings were frozen. The -3 degree plants were all frozen to death. Premature potato emergence in spring, late frosts often frozen seedlings, tubers in the soil can be re-emerged lateral buds, but delayed fertility and potato period. Shorter growth period affects yield.
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