Cucumbers can be cold and can cause a variety of symptoms. Seedlings are damaged, cotyledons are pale, and a large number of dead seedlings. The leaves are damaged, the leaves are dehydrated and turn yellow and white, the leaves are kept green at the beginning, the uninjured parts of the leaves can continue to grow, and the severely diseased seedlings are zoomed out. The growth point is chilled and watery, and then the water loses and sag and forms a bald tip. The roots are damaged, the ground temperature drops below the critical temperature, the roots stop growing, the root bark is yellow, the root tip is round and round, and there is no new root. The growth of the shoots is slow, and the plants are short and thin, so that they die.
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The minimum temperature of cucumber root growth is 8-10 °C, and the root hair is 6-8 °C. When the ground temperature of 5-10 cm is lower than 6-8 °C, the duration is long, the root hairs die, and no new root hairs are produced. Less than 3-5 °C is frozen, at this time the permeability of the root system is low, metabolic disorders, photosynthesis is reduced, and cell loss of water leads to death. Precaution:
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　　 1. Cultivate strong seedlings and enhance cold resistance. The seeds that have been sterilized and germinated have been germinated for 3-10 days at 8-10 °C , and the cold resistance is enhanced. It is also necessary to seedling seedlings and 4 leaf stage refining.
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　　 2 , timely planting, warming and insulation. Timely planting, after planting, should be covered with multiple layers of low temperature, such as mulch film, straw curtain, cold cloth, cold gully outside the shed, etc., if necessary, add geothermal line or geothermal insulation.
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Source: China Agricultural Promotion Network
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