In the case of shed vegetables without some heating, some simple and easy-to-control measures can be taken to ensure the normal growth of shed vegetables to a certain extent. The following are some common methods that are effective and effective.
 Formulate hot soil. Use chicken manure, hot organic fertilizer, cow manure and other breathable fertilizers to make hot soil, that is, when it is decomposed, take 20% each , and mix dry soil 60% . This nutrient soil has good heat absorption and heat generation performance. The growth environment of vegetable seedlings is good, the number of root growth is long and long, the absorption function is strong, the growing vegetables are strong, 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 zero, the temperature in the shed is about 5 °C, and the temperature inside the nutrient can reach 8-10 °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. The surface of the vegetable field is knotted. During the daytime, the hot air enters the tillage layer is restricted, the heat storage is reduced, and the crack is large and deep. The soil aggregate structure is poor. It is easy to dissipate heat in the first half of the night, and the room temperature is low in the middle of the night, which is easy to cause cold damage. If shallow cultivating of the shed soil, it 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.
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