Causes of sudden wilting: 1. When planting cucumber seedlings, if too much fertilizer is used in the basal fertilizer, the concentration of 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; 2 Flood irrigation can also lead to wilting of plants. After irrigation, soil water content is too high, air permeability is poor, and toxic substances are produced in the soil under anoxic conditions, causing root poisoning or anoxic asphyxia and wilt. 3. 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 freeze damage; 4. When the weather turns fine, the grass cover is suddenly uncovered, the temperature in the greenhouse is relatively low, and the area coefficient of the cucumber leaf area is large, which will cause the temperature to rise rapidly. The transpiration of the leaves is enhanced, causing the melons to lose water and wilting.
Control measures: 1. Strengthen greenhouse warming and warming work, pay attention to insulation when the cold current arrives, and pay attention to this time do not water, so as not to reduce the soil temperature; 2. More decomposed organic fertilizer, and extra-root fertilizer, root dressing outside It can spray photosynthetic nutrient film fertilizer, can help absorb a lot of light fertilizer, light energy, light, compatible with conventional fertilizers, nutrients supply to the growth and development of plants to the limit; 3. After the snow is fine, the shed should be uncovered, cover the side cover, The old leaves were removed in time and the leaves were sprayed with a new high fat film at about 20°C to reduce transpiration. After the vegetable grows back to normal growth, it can be drafted during the day. Even if it is a cloudy day, it should be drafted as much as possible so that the seedlings can see more scattered light. However, at night, it is still necessary to cover two layers of protective film to do the insulation work. 4 After the weather is fine, timely watering and fertilizing, and spraying a new high-fat membrane to prevent the infection of bacteria; 5. Watering to drip irrigation is appropriate, to avoid flood irrigation, to maintain good air permeability.
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