If spring cucumbers are not properly managed under adverse weather conditions, they can easily cause cucumbers to wilfully die and cause economic losses.
The cause of the sudden wilting of greenhouse cucumbers:
1. In the case of continuous cloudy weather, the indoor 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 freezing injury;
2. When planting cucumber seedlings, if too much fertilizer is applied in the base fertilizer, the concentration of chemical fertilizers in the soil will be high, which will damage the root tip and reduce the ability of roots to absorb water and inorganic salts;
3. When the weather turns fine, the grasshoppers are suddenly uncovered, the temperature in the 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, causing the physiological and water loss of the melons.
4. Flood irrigation can also lead to wilting of plants, excessive water content after irrigating, poor air permeability, toxic substances in the soil under hypoxic conditions, so that root poisoning or lack of oxygen suffocation and wilting of cucumber.
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. To reduce the use of fast-acting fertilizers, to make more organic fertilizers, and to apply extra-root fertilizers. The top-dressing fertilizers can be sprayed with high-efficiency phytochemicals, composite potassium dihydrogen phosphate, sprayed treasure, and plant AAA foliar fertilizers.
4. After the rainy weather, when the weather is fine, the sheds should be uncovered, cover the sides and cover the leaves, spray the leaves with warm water of about 20°C, remove the old leaves in time, and reduce the transpiration. After the seedlings return to normal growth, they can all be drafted during the day. Even if it is a cloudy day, 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 cover two layers of protective film to do the insulation work.
5. Watering, fertilizing and spraying pesticides in time after sunny days to promote seedling emergence and disease prevention and control;
6. Cucumber planting 15-20 days before planting foot water, if the living soil layer is too deep, after watering, it is necessary to level the surface again, so that the soil reaches deep, transparent, fine, flat, solid standards. Watering is suitable for drip irrigation to avoid flooding and maintain good air permeability.
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