If the spring sorghum cucumber is improperly managed under bad weather conditions, it may easily cause the cucumber to wilfully die and cause great economic losses.
The reasons for the sudden wilting of cucumber in the greenhouse: 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 freeze injury; 2. When the cucumber seedlings are colonized, if the base fertilizer is used with too much available fertilizer, the concentration of fertilizers in the soil is high, which will cause the root tip to be damaged. Reduce the ability of roots to absorb water and inorganic salts; 3. When the weather turns fine, suddenly open the haystacks, the temperature in the greenhouse is relatively low, and the larger coefficient of cucumber leaf area will make the temperature rise rapidly, and the transpiration of leaves will increase. Causes the melon to lose moisture and wilting; 4. Flood irrigation can also cause wilting of plants, irrigation water after the soil moisture is too high, permeability is poor, in the anoxic conditions produce toxic substances in the soil, so that root poisoning or lack of oxygen suffocation and Weary.
Prevention and control measures: 1. Strengthen seedling management, cultivate strong seedlings, and timely prevent and control pests and diseases; 2. Strengthen 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; Fast-acting fertilizers, mostly applied organic fertilizers, and top dressings outside the roots. Top dressings can be sprayed with highly efficient phytochemicals, composite potassium dihydrogen phosphate, sprayed treasure, and plant AAA foliar fertilizers; At the time, the greenhouse should be covered with grasshoppers, cover the sides and cover the leaves, spray warm water of about 20°C on the leaves, remove old leaves in time, and reduce 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 can see more scattered light. However, at night, it is still necessary to cover two layers of protective film to ensure good insulation; 5 Water, fertilize and spray timely after sunny, promote seedlings and prevent disease; 6. Cushion sole planting water 15-20 days before planting, if the living soil layer is too deep, need to level again after watering To make the soil 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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