The vegetables are frozen. That's how it works
What methods can help plants better protect against cold and freezing?
1 Using microbial agents or functional fertilizers,It can not only promote the root to strengthen the root but also nourish the root mulch
In low temperature environment in winter, the root activity, slow growth and absorption capacity of melons, fruits and vegetables are poor, and poor root growth and development will naturally affect the growth and robustness of the whole fruit and vegetable seedlings.
Therefore, before the arrival of low temperature freezing damage, or for those fruits and vegetables with poor root growth and stunted root development, microbial microbial agents (such as trichoderma harz, Bacillus subtilis, etc.) and functional fertilizers such as chitin, amino acid and humic acid can be used for root irrigation. For example, every 7-10 days, bacterial agent + mineral potassium xanthovic acid + chito-oligosaccharide can be used for root irrigation once. In order to promote the fruits and vegetables to promote new roots, strong roots, root maintenance effect.
2 Leaf spray anti-freezing formula
Use 80-100 grams of potassium dihydrogen phosphate +10 ml of 10-15 grams of 0.1% brassicin lactone +80-100 grams of glucose (can also be used with brown sugar) twice in a series of sprays (below 10℃ use fresh amine ester or lassin rather than brassicin lactone, because brassicin is slow to absorb at low temperature of 10℃ poor effect). Or 80-100 grams of potassium dihydrogen phosphate +30-40 ml of amino acid foliar fertilizer +40-50 ml of 0.1% S-inductin, 2-3 times in a continuous spray 10-15 days before a cold snap cold air or significant cooling, once every 5-7 days.
These two formulas can also be used to promote the rapid recovery of the affected plants after low temperature freezing injury, but when used after low temperature freezing injury, it is recommended to use together with an appropriate amount of pyrazolsterin according to the situation (to prevent the occurrence of diseases after freezing injury, first cut off the frozen tissue, and then spray).
3 As far as possible to increase the light time of fruits and vegetables, healthy cultivation Seedlings and plants, enhance the ability to withstand stress
This point is very important in the winter greenhouse vegetable planting management. In winter, the external temperature is low and the light time is short and weak. For fruits and vegetables in the shed, the longer the light time, the stronger the photosynthetic capacity of leaves, the more organic nutrients synthesized in the plant, the stronger the growth of vegetables, the stronger the stress resistance, and the higher the yield and quality in the later period.
In winter, be sure to cherish the sunny weather, when the sun comes out as much as possible put away two film, increase the light. As long as the temperature in the shed can be guaranteed, the second film should be put away as far as possible during the day to increase the astigmatism of vegetables in the shed.
In addition, we should pay attention to keep the shed film clean, avoid the shed film dust, conditional to regular cleaning, in order to maximize the amount of light in the shed.
4 The insulation protection of vegetables in the shed should be fully done and vegetables should be mplemented Scientific management of temperature change
On the one hand, before the large temperature drop in winter and after the occurrence of large rain and snow freezing weather, should be a comprehensive inspection, repair and reinforcement shed, loose, damaged, damaged places should be repaired in advance, in order to improve the sealing and insulation in the shed;
On the other hand, we should check the weather forecast every day in winter. Before the extreme weather comes, we should increase the temperature temporarily by covering the roof of the shed with multiple layers, adding a small arch shed in the shed and temporarily adding furnaces, electric hot air, heating hotlines and filling lights in the shed. In general, ensure that the temperature in the shed is not lower than 20 ° C and the temperature at night is not lower than 15 ° C.
5 Before cooling watering can prevent freezing, low temperature environment watering quantity is not Should be too large, watering depends on moisture, seedling situation and weather change
Because water has the effect of heat absorption and heat dissipation, so before the arrival of cold current in winter, you can choose a sunny day when the noon temperature is higher in advance watering, in order to increase the soil moisture content, so that the soil moisture in advance heat storage heat, until cooling can be used in the soil water heat dissipation way to prevent frozen damage to fruit and vegetable crops.
But it should be noted that watering must be carried out about 3 days after the arrival of low temperature freezing damage. The watering quantity should be watered on the same day and penetrated into the ground on the same day. After cooling, continuous cloudy rain and snow weather must not be watered immediately, otherwise it will further reduce soil temperature harm crop roots.
Winter watering should be as far as possible to choose sunny and warm weather in the morning, immediately after watering to close the shed for warming, after the temperature rises, and then timely ventilation and humidity; In addition, winter watering must not be too large.
6 In winter, it is recommended to cover the ground for soil moisture preservation and mulch
Generally speaking, before the arrival of winter, it is recommended to use straw, straw, chaff, weeds or mulch to evenly cover the ground between the rows of crops. The amount of straw mulch should be controlled at about 150-200 kg per mu, which can not only prevent the cold wind from blowing the mulch of the roots of crops, but also improve the soil temperature and prevent frozen roots of fruits and vegetables. In addition, Covering the ground with straw and mulching film can also keep the soil moisture stable and avoid excessive humidity in the shed. After straw and straw rot, it can also increase the content of organic matter in the soil and improve the porous permeability of the soil.
How to correct rescue treatment after plant cryogenic damage?
Many friends in the plant after the occurrence of low temperature freezing damage, often immediately cut the plant was frozen to death tissue, and the plant suffering from low temperature freezing damage is no longer management, in fact, this is a very wrong approach.
Here to give you a brief introduction to the correct operation method of plant cold damage:
The first point: plant frostbite frozen organs and tissues do not immediately cut off (it is easy to lead to further weakness of the plant, and it is not easy to find the tissues that have occurred frostbite and do not show symptoms of frostbite), but to wait until the weather is good and the temperature is stable, and then to prune away the parts of serious frostbite (such as discoloration, dry shrinkage, fracture, wilt, necrosis and other symptoms).
Second point: After pruning plants with serious freezing damage, fungicides should be used in time (such as methicillin, amine fresh ester, imidamine, pyrazole ether ester, mancozeb, chlorothalonil, methyl trobuzine, etc.) for comprehensive spraying, to prevent external germs from infecting and causing disease when plants are weak after freezing damage, and to pay attention to nutrient supplementation (spray effect is good).
It is recommended to use potassium dihydrogen phosphate + pyrazolium + brassicolide (above 10℃) or amine fresh ester (below 10℃) for 2-3 consecutive sprays, once every 7 days or so.