Several cold weather, severe winds, strong cooling, continuous yin, rain and snow and other severe weather occur frequently. The pest prevention and control team of the vegetable industry innovation system of Hebei Province reminded the province's large-scale facility vegetable growers to take timely preventive measures to minimize the impact. . The specific recommendations are as follows:
In windy weather, greenhouses and greenhouses should be fastened with fittings such as connector slots and tie rods to avoid damage to the structure of the booth caused by strong winds. The sheds with insulation coverings should be properly lowered and quilted and fixed to reduce the wind. The tearing of the insulation cover and the shed film.
Conditional sheds are ready for warming facilities. For example, using environmentally-friendly warming blocks, you can also cover two layers of film or erect small arch sheds in the shed to ensure the temperature inside the shed.
In the event of rain and snow, it is necessary to clean the shed film in time, remove snow, ensure the transmittance of the shed film, and allow the vegetables to receive light when the temperature permits. The conditional shed can use artificial light supplement such as fill light.
Due to the sudden temperature drop, the greenhouse will increase, and the humidity in the shed will increase. The farmers should observe the temperature and humidity in the shed in time. Combined with the weather forecast, under the premise of ensuring the lowest temperature, the air is ventilated for 10 minutes every morning, minimizing The humidity in the shed reduces the occurrence of diseases. Although the outside temperature is the highest time of the day at noon, there may still be a temperature difference of more than 10 °C in the shed. In order to minimize heat loss in the shed, it is recommended to ventilate in the morning for a short time. The foliage is sprayed with potassium dihydrogen phosphate and plant stimulating hormones such as amino acids, humic acid or alginic acid to improve the cold resistance of the plants.
Unfavorable environmental conditions are likely to cause gray mold. It is recommended to use antibiotics such as boscalamide, fluoxazole, iprodione, and cyprodinil (for melons). However, in low temperature environment, the leaf's ability to absorb and metabolize is relatively weak. When spraying foliar fertilizer or pesticide, the concentration should be strictly controlled, and mixed spraying of various foliar fertilizers and chemicals should be avoided to avoid phytotoxicity.
Even after cloudy or snow, the heat preservation or straw curtain should not be fully released. It is best to gradually let go, to prevent the plants from heating up too fast, and to have symptoms such as dehydration and snoring. The water can be properly sprayed with warm water, and amino acid and humic acid foliar fertilizer can be added to promote the rapid growth of the plant.
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