According to conventional management, rooting is below 10°C and grafted roots are below 3°C. Growth is affected and even freezing damage occurs. If the indoor heating method is used to prevent freezing, it may cause smoke damage and hot flash dehydration flash or freezing injury. Here are some anti-freeze measures without heating:
1. Nutrition nursery. Black plastic nutrients have the function of absorbing heat during the day and protecting the roots at night. In the greenhouse, the nutrients can be used to raise the seedlings. The temperature in the nutrient bowl can be about 20°C higher than the outside temperature, and the seedlings can grow slowly and free from frost damage.
2. Preparation of hot nutrient soil. Chicken manure and cow dung were each taken 20% after decomposed, and then mixed with 60% of Yangyang. The seedlings were grown in this nutrient soil and the plants were resistant to freezing and robustness.
3. Irrigation rooting with rooting ingredients. The rooting element is reasonably formulated with calcium, phosphorus, zinc and other long-root related nutrient elements. After rooting with rooting agent, the root system can increase about 70%, the root depth can increase by about 25%, and the root system can be developed to increase absorption capacity. Will not freeze the seedlings;
4. Insulation of cold water prevents freezing. Before pouring water in winter or selecting good weather (water can be watered above 20°C), filling enough water can prevent freezing injury;
5 cultivator insulation and cold. Shallow cultivator can break the ground and cracks, you can control the transpiration of groundwater to take away the heat, but also protect the insulation and cold seedlings;
6. The foliar spray nutrient solution is resistant to cold. Foliar sprayed rice vinegar can inhibit bacteria and insects, and mixed with sugar and superphosphate, can increase the degree of sugar and hardness of mesophyll, and improve cold resistance.
7. Repeatedly released the wind on a sunny day. The long-term freezing temperature should be repeatedly released, so that the temperature difference between indoor and outdoor, and room temperature close to the previous few days, so that plants slowly adapt to the environment, robust growth, beware of a long day, ten days cold, causing flash seedlings and freezing injury;
8. Supplement carbon dioxide. Carbon dioxide can increase plant resistance and yield. Closing the greenhouse when the temperature is low and artificially supplementing carbon dioxide can increase the cold resistance of crops and greatly increase the yield;
9. Cover and keep warm. According to the temperature in winter and the day, the temperature at room temperature can be maintained to about 18°C ​​after one hour, and it can be covered later than 18°C.
10. After the wall hanging reflective film temperature. Before and after the winter solstice, a plastic film reflecting on the back wall can increase the light intensity of the cultivation bed, and at the same time, slowly release the heat energy stored in the wall in the room, so as to maintain a higher temperature in the middle of the night and prevent the freezing and injury of the seedlings and plants;
11. Cover multi-layer insulation. Covering a layer of grass outside the grasshopper, or supporting a film at a depth of 20 cm, forming an insulation layer, which can increase the room temperature by 1-3 °C;
12. Choose rice straw. The use of rice straw can reduce conductive heat loss, and the minimum room temperature night temperature can be increased by 2-3 °C;
13. Electric light to increase temperature. Turning on the light for vegetables for 3-4 hours in the morning and evening on cloudy days can increase the yield by 10%-40% and shorten the vegetative growth period by 17-21 days.
14. Use a purple film. Ultraviolet spectrum can inhibit the sterilization of diseases, control plant growth and promote product accumulation. The use of purple film, before and after the winter solstice can be 2-3 °C higher than the green film.
1. Nutrition nursery. Black plastic nutrients have the function of absorbing heat during the day and protecting the roots at night. In the greenhouse, the nutrients can be used to raise the seedlings. The temperature in the nutrient bowl can be about 20°C higher than the outside temperature, and the seedlings can grow slowly and free from frost damage.
2. Preparation of hot nutrient soil. Chicken manure and cow dung were each taken 20% after decomposed, and then mixed with 60% of Yangyang. The seedlings were grown in this nutrient soil and the plants were resistant to freezing and robustness.
3. Irrigation rooting with rooting ingredients. The rooting element is reasonably formulated with calcium, phosphorus, zinc and other long-root related nutrient elements. After rooting with rooting agent, the root system can increase about 70%, the root depth can increase by about 25%, and the root system can be developed to increase absorption capacity. Will not freeze the seedlings;
4. Insulation of cold water prevents freezing. Before pouring water in winter or selecting good weather (water can be watered above 20°C), filling enough water can prevent freezing injury;
5 cultivator insulation and cold. Shallow cultivator can break the ground and cracks, you can control the transpiration of groundwater to take away the heat, but also protect the insulation and cold seedlings;
6. The foliar spray nutrient solution is resistant to cold. Foliar sprayed rice vinegar can inhibit bacteria and insects, and mixed with sugar and superphosphate, can increase the degree of sugar and hardness of mesophyll, and improve cold resistance.
7. Repeatedly released the wind on a sunny day. The long-term freezing temperature should be repeatedly released, so that the temperature difference between indoor and outdoor, and room temperature close to the previous few days, so that plants slowly adapt to the environment, robust growth, beware of a long day, ten days cold, causing flash seedlings and freezing injury;
8. Supplement carbon dioxide. Carbon dioxide can increase plant resistance and yield. Closing the greenhouse when the temperature is low and artificially supplementing carbon dioxide can increase the cold resistance of crops and greatly increase the yield;
9. Cover and keep warm. According to the temperature in winter and the day, the temperature at room temperature can be maintained to about 18°C ​​after one hour, and it can be covered later than 18°C.
10. After the wall hanging reflective film temperature. Before and after the winter solstice, a plastic film reflecting on the back wall can increase the light intensity of the cultivation bed, and at the same time, slowly release the heat energy stored in the wall in the room, so as to maintain a higher temperature in the middle of the night and prevent the freezing and injury of the seedlings and plants;
11. Cover multi-layer insulation. Covering a layer of grass outside the grasshopper, or supporting a film at a depth of 20 cm, forming an insulation layer, which can increase the room temperature by 1-3 °C;
12. Choose rice straw. The use of rice straw can reduce conductive heat loss, and the minimum room temperature night temperature can be increased by 2-3 °C;
13. Electric light to increase temperature. Turning on the light for vegetables for 3-4 hours in the morning and evening on cloudy days can increase the yield by 10%-40% and shorten the vegetative growth period by 17-21 days.
14. Use a purple film. Ultraviolet spectrum can inhibit the sterilization of diseases, control plant growth and promote product accumulation. The use of purple film, before and after the winter solstice can be 2-3 °C higher than the green film.
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