Winter vegetables often suffer from poor weather and cold weather, frost and snow, and other insults, which often lead to large economic losses. The following describes several methods of preventing cold.
First, control of nitrogen
Appropriately reduce the amount of nitrogen fertilizer in the seedling stage, avoid applying nitrogen fertilizer to avoid plant growth and tenderness, and poor cold resistance. Topdressing should be early to promote the robustness of the seedlings. No quick-acting nitrogen fertilizer should be applied before low temperature, and 0.2-0.3% potassium dihydrogen phosphate should be sprayed 1-2 times.
Second, fertilization
Grasping the weather and the weather, using cows, pig manure or compost and other warm household fertilizers of 2,000-3,000 kilograms per 667 square meters, applied to the rhizosphere of the vegetable roots, can increase the soil temperature by 2-3 degrees.
Third, before the frozen soil is combined with cultivating, the mashed soil is placed at the root of the vegetable, which can loosen the soil and directly protect the root system, but the depth of cultivating is 7-8 cm.
Fourth, smoke
Weeds, straws, litter, etc. are piled up in piles. Except for the ignition, the rest is lightly compacted with dry fine yellow mud. Before the frost comes, the smoke is ignited at the ignition of the wind, such as an open flame, and then fine The earth pressure seal can not only dispel the cold current invasion, but also accumulate the fire soil fertilizer.
Five, jet
The petroleum anti-steaming agent can spray 30-40 times of petroleum anti-steaming agent on the sunny day before the cold current, which can form an invisible cold-proof film on the leaf, which is beneficial to reduce the transpiration of the leaf and protect it. Vegetables are warm and cold-proof.
6. Before the damp is frozen, use 400-500 kg of thin manure per 667 square meters. Sprinkle on the vegetable soil to reduce the freezing degree of the vegetable soil and reduce the freezing damage.
Seven, winter irrigation
1 to 2 days before the cold current invasion, the weather is sunny and sunny; after freezing, it must be noted that after the cold current, the weather does warm up, the soil temperature rises to 2-3 degrees, and the soil and vegetables can be thawed. Otherwise, Will increase the freezing damage. Winter irrigation should be poured out, and the field water should be able to seep out on the same day. After pouring water, seize the favorable opportunity to carry out the soil insulation.
Eight, coverage
In the afternoon before freezing, cover the clams or vegetables with straw, etc., but the covered straw should be diluted, so do not cover the vegetables to avoid affecting photosynthesis. It is advisable to cover 100 kilograms per 667 square meters of straw.
Nine, ash
Before the cold damage occurs, sprinkle a layer of thin ash or grass ash on the vegetables, or weed ash or fire ash between the rows of vegetables for 1000 kg per 667 square meters, which can not only prevent cold and freeze, but also increase fertilizer, and also The root rot of vegetables has a good control effect.
10. Precipitation for vegetable fields with high groundwater level such as cold stains and low water, grasp the “three ditch†and ensure the smooth flow of ditch, so as to reduce the water level, eliminate waterlogging, increase soil temperature and promote vegetable growth.
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