The core message: As the cold air strengthens, the trend of declining temperatures is accelerated, and the temperature inside the shed is also low, especially for some old sheds and sheds with poor heat insulation. Plants are prone to low-temperature obstacles such as yellow leaves, If the tip of the blade is drooping, severe freezing injury may occur. In this reminder vegetable farmers must do a good job of insulation work before the onset of the cold, strengthen management, prevent vegetables from being chilled.
Recognize the cold face of a few "faces"
When the leaf temperature is below 10°C, the vegetables will show drooping leaves and wrinkles around the leaves. The leaves developed at low temperatures are deep and the leaves are long, dark in color, and grow slowly.
Water-staining symptoms are caused by the low temperature at night, especially when the ground temperature is high, and the water in the cells flows into the intercellular space. When the plant grows well, water spots can disappear after the sun comes out. However, if the plants are weakened or completely weakened, the water temperature in the daytime will not disappear. This will cause the cells to die and the leaves to die after repeated cycles.
Due to the low night temperature, the carbohydrates produced by photosynthetic production cannot be moved to the outside in time, and they are deposited in the leaves. If the temperature rises for a period of time and the carbohydrates can be successfully and fully converted, the fruit can expand smoothly and the leaves can slowly recover.
Several "magic weapons" for preventing cold damage
Strengthen the insulation of the greenhouse to put a few pieces of old grasshoppers horizontally in front of the greenhouse. In the afternoon, when it is put in the greenhouse, it should be covered between the underside of the grass curtain and the film at the front face, so that the straw curtain and the film can be The gap fills up, increasing the thickness of the grass curtain at the front face, thereby improving the insulation effect. In addition to the external grasshoppers, it is also possible to cover the inner side of the shed film on the inside of the greenhouse with a layer of nonwoven fabric of about two meters in width, close to the soil on the front face, which can effectively prevent the cold outside the shed from affecting the shed and reduce the heat in the shed. Lost in order to achieve the purpose of night heat preservation.
Increasing Soil Humidity A vegetable farmer can pour small water appropriately to increase soil moisture and use characteristics of higher specific moisture and slower heat dissipation to increase the heat storage capacity of the shed and increase the night temperature in the shed. Moreover, the soil moisture content in the shed is moderate, so that the cracks in the cultivating layer are fine and the soil insulation effect is better.
Spraying foliar vegetable growers can spray 27% high-fat film emulsion 80 to 100 times, 1000 times of chitin and Tianda 2116 before the advent of the cold to improve the plant's resistance to stress.
Several "tricks" for remedying cold damage
After the slow warming and slow release of the cold wave, the weather is clear, the light is strong, the temperature rises rapidly, and the plants have not yet recovered. Warming up too fast will only increase the damage to the vegetables. It is necessary to gradually increase the light, increase the temperature, and ensure that the leaf function gradually recovers. When the temperature in the booth is too high and the air must be released, be sure to take care not to pull the air outlet too large at one time. Slowly lower the temperature. To prevent excessive urgency, cause greater harm.
Strengthen the fertilizer and water management After the plants are affected by chilling, do not immediately apply water to topdressing. After 3-4 days of weather, topdressing chitin, amino acids and other root-feeding products, together with high-nitrogen total water-soluble fertilizers to promote root regeneration. In addition, pay attention to foliar dressing, you can immediately after the victim spraying 1000 times of chitin, 500 times the total nutrient foliar fertilizer, sugar 100 times, etc., can not only improve the nutritional status of the crop, but also increase the concentration of cell tissue fluid, enhance the plant Cold-resistant anti-freezing ability, promote recovery and growth.
After the moderately shaded plants are cold, when the weather is fine, direct exposure to strong light can easily lead to tissue loss, dry shrinkage and wilting. In severe cases, the plants will die. Therefore, it is necessary to block it, reduce the intensity of sunlight, and avoid overheating. Http://Content/5c7b7a6f-c7f3-41a1-9464-4c4fa53ba399?cType=2
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