First, the cause of wilting
First, in the 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 vegetables and seedlings is weak. In this case, the greenhouse cucumber seedlings with poor heat insulation are prone to frost damage.
Second, when planting cucumber seedlings, if there are too many fertilizers available 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.
Third, when the weather turns fine after the snow, suddenly the grasshoppers are uncovered, the temperature in snow-covered greenhouses is low, and the area coefficient of cucumber leaves is large. Suddenly, the temperature will rise rapidly, and the transpiration of the leaves will increase, resulting in the physiological loss of water. And wilting.
Fourth, flooding can also lead to wilting plants. After irrigation, the soil moisture content is too high, the air permeability is poor, and toxic substances are produced in the soil under anoxic conditions, so that the root system poisons or lacks oxygen to suffocate and wilts.
Second, preventive measures
The first is to strengthen the seedling management and nurturing strong seedlings to prevent and treat pests and diseases in a timely manner.
The second is to strengthen the greenhouse warming and warming work, pay attention to insulation when the cold current comes, and pay attention not to water, so as not to reduce the soil temperature.
The third is to reduce the use of fast-acting chemical fertilizers, to make more organic fertilizers, and to apply fertilizers outside the roots. The top-dressing fertilizers can be sprayed with potassium dihydrogen phosphate and sprayed with foliar fertilizers.
Fourth, when the weather is fine in the snow, the sheds should be uncovered one at a time, and the leaves should be sprayed with warm water at about 20°C. The old leaves should be removed timely to reduce the transpiration. After the seedlings return to normal growth, they are all pulled up and drafted. Fifth, 15 to 20 days before the cucumber planting foot pouring water, if the soil is more sturdy, watering leveling after the need to re-surface, so that the soil to achieve a thorough, fine, flat, solid standards. Watering is suitable for drip irrigation to avoid flooding and maintain good air permeability.
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