If the winter and spring cucumbers are improperly managed under bad weather conditions in winter, they may easily cause the cucumbers to wilfully die and cause great economic losses.
Causes of sudden wilting of cucumber in winter greenhouse
1. In case of heavy snowfall, the weather in the room is low for a long time and the ground temperature is low, and the growth of the seedlings is weak. In this case, the greenhouse cucumber seedlings with poor heat insulation are prone to frost damage.
2. When planting cucumber seedlings, if there are too many fertilizers available in the base fertilizer, the concentration of fertilizers 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.
3. When the weather turns fine after the snow, when the grass is suddenly uncovered, the temperature in the snow-covered greenhouse is relatively low, and the area coefficient of the cucumber leaf area is relatively large. Suddenly, the temperature will rise rapidly and the transpiration of the leaves will increase, resulting in physiological water loss. Weary.
4. Flood irrigation can also lead to wilting of plants. After irrigation, soil water content is too high, and the air permeability is poor. In the absence of oxygen, toxic substances are generated in the soil, causing root poisoning or lack of oxygen to asphyxiate and wilt.
Prevention
1. Strengthen the seedling management to cultivate strong seedlings and timely prevent and control pests and diseases.
2. Strengthen the greenhouse warming and warming work, pay attention to insulation when the cold current arrives, and pay attention not to water at this time, so as not to reduce the soil temperature.
3. Reduce the use of fast-acting fertilizers, apply more organic fertilizers, and apply extra-root fertilizers. The top-dressing fertilizers can be sprayed with high-efficiency phytochemicals, potassium dihydrogen phosphate, sprayed fertilizer, and plant AAA foliar fertilizers.
4. After the snow is fine, the sheds should be uncovered, covered with cover, and the leaves are sprayed with warm water at about 20°C to remove old leaves in time and reduce 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 fine weather promote seedling emergence and disease prevention and control.
5. 15 to 20 days before the cucumber planting foot pouring water, if the living soil layer is too deep, after the watering leveling again to make the soil 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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