In the case of non-warming vegetables in the greenhouse, some simple and cold-resistant measures can be taken to ensure the normal growth of the greenhouse vegetables to a certain extent.
Formulate hot soil. Use chicken manure, hot organic fertilizer, cow manure and other gas permeable fertilizers to prepare hot soil, that is, when it is decomposed, take 20% each, and mix dry soil 60%, such nutrient soil has good heat absorption and heat generation performance. The roots of vegetable seedlings grow in a large number and have long absorption function, and the natural cold resistance is strong.
Nutritional seedlings. Black plastic nutrient seedlings are used to absorb heat and protect the roots during the day. When the outside temperature is below 0 °C, the temperature of the carton in the shed is about 5 °C, and the temperature inside the nutrient can reach 8 °C -10 °C. The vegetable seedlings can be slow. Growing without freezing damage.
Control the application of nitrogen fertilizer. Appropriately reduce the amount of nitrogen fertilizer in the seedling stage, and do not apply chemical nitrogen fertilizer to avoid the cold resistance of vegetables. It is advisable to topdress the fertilizer to promote the vegetable seedlings. The fast-acting nitrogen fertilizer cannot be applied before the low temperature, and the phosphorus and potassium fertilizer should be applied once to enhance the cold resistance. The winter light is weak, the vegetable fertilizer absorption ability is poor, and the leaf surface sprays the photosynthetic micro-fertilizer, which can prevent and cure the deficiency caused by the lack of nutrients in the root system. At the same time, it should use less or no growth hormone to prevent the growth and tenderness and reduce the cold resistance. .
Shallow cultivating insulation. Shallow cultivating of the shed soil can play the role of breaking the knot and replenishing the cracks. It can not only control the transpiration of the groundwater, but also protect the heat preservation and cold protection.
Rooting and rooting. After wintering, the root system can increase the root system by about 60% and the root depth by about 25%. The roots are developed with strong absorption capacity, and there will be no frostbite caused by lack of water and deficiency.
Fill the water to prevent freezing. Winter vegetable freeze damage is mostly caused by lack of water. Because water has higher specific heat than air and slow heat dissipation, if the soil moisture content is moderate, the pores and cracks in the tillage layer are fine, and the root system is not suspended, the soil heat insulation can be improved, and the root system will not be damaged by freezing. Therefore, the shed can be filled with water before winter or when the weather is good (when above 20 °C), the anti-freezing effect is good.
Supplemented with carbon. The vegetables cultivated in the greenhouse can absorb carbon dioxide generated by night plant respiration and soil microbial decomposition 1 hour after the sun comes out, and then they are in a carbon starvation state. Therefore, when the temperature is high on a sunny day, the shed film can be opened and closed, and the carbon dioxide can be put into the outside to improve the cold resistance and yield of the vegetables. When the temperature is low, the shed can be closed, and in winter, carbon dioxide can be artificially supplemented.
Multilayer film covering. The insulation performance of a layer of shed film is poor, and the lowest temperature is only 2 °C - 3 °C higher than the open field. Therefore, when the outside temperature drops to -3 °C, the shed will be around 0 °C, and freezing damage will occur. It is required to cover the small shed film in the greenhouse. It is best to cover two layers of old agricultural film on the small shed. For example, the woven bag is added on the small shed film, or the shade net and the straw curtain are more insulated. The outside temperature drops to -5. At °C, there is generally no frost damage in the shed.
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