How to prevent vegetable chilling injury in low temperature weather? The reporter recently interviewed experts in vegetable greenhouses. "Greenhouse vegetable production often encounters different weather conditions, and changes in weather will directly affect the normal growth of cultivated plants." said Ma Xinli, chief technology consultant and senior agronomist of "Vegetables" magazine. Greenhouse production depends on the weather and smart management.
Ma Xinli reminded that the snowfall and cold weather can easily lead to lower temperature and ground temperature in the greenhouse, decreased photosynthesis, and difficulty in absorbing nutrients by the roots, which has a great impact on the growth of vegetables. At the same time, the humidity in the greenhouse is relatively high, which is likely to cause disease. Therefore, farmers can take measures from the following aspects to improve the temperature in the greenhouse and reduce the impact of adverse weather on the greenhouse vegetables:
One is to add light and fill light. In the case of cooling, as long as the temperature is not very low, be sure to uncover the grass thatch and other coverings and use scattered light to increase the light. If conditions permit, install sunlight lamps in the shed to supplement light and increase light. In addition, clean the shed film in time to maintain the light transmittance of the shed film.
The second is to increase temperature and keep warm. For sheds with thin walls and poor thermal insulation, increase the thickness of the straw curtain or insulation quilt, cover the outside of the straw curtain or insulation quilt with 1-2 layers of plastic film, and keep the straw curtain or insulation quilt dry ; The ground in the greenhouse is covered with wheat straw, wheat bran or flour corn stalks to prevent heat dissipation in the soil and increase the ground temperature; 1 to 2 layers of canopy can be hung in the high place in the greenhouse; heating measures should be taken if the room temperature is lower than 6℃ , Burning stove, warm air stove, burning fuel block to increase temperature and fertilizer, etc. methods, but pay attention to safety, do not make the temperature rise too fast.
The third is to strengthen cultivation management. For vegetables that are being harvested, such as cucumbers and eggplants, pick them early and small to reduce excessive nutrient consumption by the fruits. The main purpose is to preserve roots, seedlings, and livelihoods. Try not to be greedy for yield. At the same time, stop watering and top dressing to avoid retting and cold roots of vegetables and aggravating diseases.
The fourth is to strengthen disease control. Under severe weather, the growth of the plants weakens and the resistance decreases. Try to use aerosol or dust to prevent diseases, reduce humidity in the shed, and avoid diseases caused by high humidity.
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