Preserved vegetable winter frost protection
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Preventive measures to control the amount of nitrogen fertilizer in the vegetable seedlings appropriate to reduce the amount of nitrogen fertilizer to prevent the growth of young plants, poor cold resistance. Fertilize early and cultivate strong seedlings. Before the advent of low temperature, it is not suitable to apply quick-acting nitrogen fertilizer. You can spray 0.2%-0.4% potassium dihydrogen phosphate solution 2 or 3 times.
When the nutrients are low in temperature and light is weak, the vegetable's ability to absorb nutrients is poor. In particular, when the leaves are subjected to freezing injury, the leaf surface is atrophied and the photosynthesis ability is even worse. At this time, it is necessary to use as little or no growth hormone as possible, and the rice vinegar can be sprayed. White sugar and superphosphate 100 to 300 times, supplement crop nutrients, increase leaf meat hardness and sugar content, improve cold resistance, and mitigate the extent of freezing injury.
The use of rooting elements is rationally formulated with calcium, phosphorus, zinc, and other nutrients that promote rooting. Calcium determines the thickness of the root system, phosphorus determines the number of root systems, and zinc determines the growth rate and length of the root system. After using the rooting agent, the root system is well developed and has strong absorptive capacity. It will not cause cold-frozen vegetable seedlings due to lack of water.
Before the onset of cold frost, spray 72% of agricultural streptomycin sulfate to 4000 times, in order to reduce the number of ice nucleation bacteria; spray cold-preventing agent 150ml or 10% of Baolifeng antifreezing agent per acre before the cold current. 400 times liquid, can enhance the ability of plants to resist cold. The use of cold-resistance agents will cause varying degrees of contamination of vegetables, and it is necessary to control the number of uses.
Multi-layered coverage increased insulation measures, covering the vegetable field with plastic film, take a small arch shed and so on.
Increase the amount of light into the light The suspended light curtain can reduce the wall to absorb heat energy, increase the amount of light in the facility, and increase the shelf temperature by 2 to 3°C. Remove and scrub the debris on the surface of the film or glass in time to increase the light transmittance.
When artificial warming occurs in cold weather, frost, rainy days and other bad weather, it is possible to ignite flue-cured or coal-fired stoves such as straw or sawdust, and increase the temperature inside the shelter where the vegetables are kept away from the place, but the harmful gases should be eliminated promptly. Conditions can be laid on the ground heating wire to improve the temperature inside the shed, you can also install a number of light bulbs to heat up, turn on the lights in the cloudy morning and evening fill light 2 to 3 hours.
Set cold-proof ditch dig 40-60 cm deep and 40-50 cm wide cold protection ditch around the protection facility, fill in human dung, sawdust, or straw, etc. The top cover is solid and the cover soil is slightly higher than the ground to prevent the ground temperature. Lost outside to improve the ground temperature. The addition of organic fertilizer can also increase the ground temperature inside the facility and make the vegetable seedlings grow robustly.
Remedial measures Avoid light before thawing Before vegetables are frozen without thawing, direct sunlight can cause the frozen tissues to lose water and wilting. Use a straw curtain to cover the shed film or glass windows, or cover the frozen vegetables with newspapers, etc. Frozen vegetables thaw slowly and resume growth.
The water spray restores tissue and freezes the vegetables. After the sun does not come out in the morning, it sprays well water, causing the protoplasm and cell walls to swell and swell.
After spraying the phytoremediation agent, the vegetables can be sprayed with a phytoremediation agent to repair the frozen leaves so that the leaves can be flattened, green, and restored. In the vegetable fields, the application of fire ash or ash, and the timely spraying of water, can also restore the frozen vegetables.
After reducing the amount of ventilation after freezing the vegetables are frozen, they can not take measures to sharply increase the temperature. Do not first remove the top cover, the top vents from small to large release, so that the temperature slowly increased inside the shed to avoid sudden temperature rise, so that frozen tissue necrosis. After the frozen vegetables are rejuvenated, they should be prevented from being re-frozen, and soil should be loosened in time to apply appropriate amount of available fertilizer to promote plant growth.