If the winter and spring cucumbers are improperly managed under adverse weather conditions in winter, they can easily cause the cucumbers to wilfully die and cause economic losses.
The reason of the sudden wilting of cucumbers in winter greenhouses is that when the snow is continuously overcast, the room is exposed to low temperature and low temperature for a long time, the ground temperature is low, and the growth of vegetables and seedlings is weak. In this case, the greenhouse cucumber seedlings with poor heat insulation are prone to freeze damage; when the cucumber seedlings are colonized, if the base fertilizer has too much fertilizer available in the base fertilizer, the concentration of fertilizers in the soil will be high and the root tip will be damaged and reduced. The ability of roots to absorb moisture and inorganic salts; when the weather turns fine after snowfall, the grasshoppers are suddenly uncovered, the temperature in the snow-covered greenhouse is relatively low, and the area coefficient of cucumber leaf area is large, which will cause the temperature to rise rapidly, and the transpiration of the leaves will increase. Phyllostachys membranaceus physiological loss of water and wilt; flood irrigation can also lead to wilting plants, water content after irrigation, soil moisture is too high, permeability is poor, in the absence of oxygen in the soil to produce toxic substances, so that root poisoning or lack of oxygen suffocation and wilt.
Preventive measures to strengthen seedling management to cultivate strong seedlings, timely prevention and control of pests and diseases; strengthen greenhouse warming and warming work, pay attention to insulation when the cold flow comes, and pay attention to this time do not water, so as not to reduce the soil temperature; less application of fast-acting fertilizer, and more decomposed Organic Fertilizers, and top dressings outside the roots, top dressings can be sprayed with highly effective phytochemicals, composite potassium dihydrogen phosphate, sprayed treasure, plant AAA and other foliar fertilizers; Cover the cover, spray the leaves with warm water of about 20°C, remove the old leaves in time, and reduce the transpiration. After returning to normal growth, the seedlings can be drafted during the day. Even if it is cloudy, drafting should be done as far as possible so that the seedlings will see more scattered light. However, at night, it is still necessary to put on two layers of protective film to prevent thermal insulation. Seedlings were frozen for the second time. Watering, fertilizing, and spraying pesticides in time after sunny days promote seedling emergence and disease prevention; 15 to 20 days before planting, cucumbers should be poured with enough water. If the living soil layer is too deep, it must be leveled again after watering to make soil easier. Reach deep, transparent, fine, flat and solid standards. Watering is suitable for drip irrigation to avoid flooding and maintain good air permeability.
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