Before and after the beginning of spring, the temperature in the shed is low, the humidity is high, the light is weak, the vegetables are weak, the growth is poor, the resistance is low, and various diseases are prone to occur. The vegetable farmers must pay attention to strengthen prevention. After pulling the shed in the morning, you should immediately enter the shed to observe the growth of vegetables and check if there is any disease infection. Once there is a disease spot, it should be sprayed immediately.
When disease prevention, vegetable farmers can choose air disinfection tablets to cut off the path of pathogens, usually 3-5 days, to prevent gray-borne diseases such as gray mold and downy mildew; in addition, after pruning, the grass should be sprayed in advance. Biobacteria such as Bacillus, Trichoderma harzianum, chitosan, etc., to improve the stem and leaf, to avoid the incidence of pathogen infection. If the disease has already occurred, the disease type should be judged first, and the symptomatic medication should be used to quickly prevent and cure the disease and avoid its outbreak.
Strengthen insulation and cold damage
Remind the vegetable growers to check the shed wall, door, and film gap in time before the cold air comes. If there is a small hole in the shed film, it should be glued in time. Outside the doorway, the worn quilt is blocked, especially in the shed that opens in the north. The old shed with thin walls can be used to assist the insulation before the temperature of the weather can be followed by a row of corn stalks along the back wall of the shed. After the snowfall and cooling weather, the straw curtain should be covered in time to prevent the rain and snow from wetting the straw curtain. If the ground is too dry, pour a little water to make the temperature more stable, put a few large tanks of water, or buy some hoses filled with water and put them in the line, all have a stable temperature effect. Vegetable farmers can also increase the temperature in the shed by ensuring the cold weather, adding straw curtains, keeping the thickness of the insulation, and laying the mulch on the arch to ensure the normal growth of the vegetables.
For the arch shed, the vegetable grower can improve the heat preservation by setting the cover film and covering the non-woven fabric on both sides of the arch shed. In addition, you should prepare a greenhouse to increase the temperature. In general, using 6-8 blocks per mu of sheds can increase the shed temperature by 4-5 °C in a short period of time, which can effectively reduce the occurrence of freezing damage. When the cold current is strong, you can ignite twice in the middle of the night to around four o'clock to ensure that the vegetables are safe from freezing.
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