The reason for the occurrence: In the case of heavy snow and cloudy weather, the indoor temperature is low and the temperature is low, the ground temperature is low, and the seedling growth is weak. In this case, the greenhouse cucumber seedlings with poor heat retention are highly susceptible to freezing damage and wilting. When planting cucumber seedlings, if the application of quick-acting chemical fertilizers in the base fertilizer is too high, the concentration of chemical fertilizer in the soil will be high, which will damage the root tip and reduce the ability of the roots to absorb water and inorganic salts to cause the plants to wilting. When the weather turns fine after the snow, the grasshoppers are suddenly uncovered. The temperature in the snow shed is relatively low. The area coefficient of the cucumber leaves is large, which will cause the temperature to rise rapidly and the transpiration of the leaves to increase, causing the physiology of the melons to lose water and wilting.
Control measures: Strengthen seedling management and cultivate strong seedlings. Strengthen the warmth and warmth of the shed, pay attention to the insulation when the cold current arrives, and pay attention to not watering at this time, so as not to reduce the soil temperature. Less application of quick-acting fertilizer, more application of decomposed organic fertilizer, and root dressing, root dressing can be sprayed with high-efficiency phytohormone, compound potassium dihydrogen phosphate, spray Shibao and other foliar fertilizer. When the weather is fine after the snow, the shed should be uncovered, and the side cover will be uncovered. The warm water of about 20 °C will be sprayed on the leaf surface, and the old leaves will be removed in time to reduce the transpiration. Watering should be done with drip irrigation to avoid flooding and keep the soil well ventilated.
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