After planting or transplanting vegetables, the temperature drops. What should I do if it is windy?

In early spring, late autumn and winter, vegetables are most afraid of temperature drop after sowing, especially in windy weather. If the agricultural film is uncovered, the transplanted seedlings will freeze to death overnight. After planting or transplanting vegetables, the temperature drops. What should I do if it is windy?

When the temperature is increased and decreased in low temperature season, the time of seed germination and emergence will be prolonged, which will seriously cause the phenomenon of rotten seeds and roots. When this happens, take the following measures immediately:

1. The simplest and most effective measure is to cover it with plastic film or agricultural film. Covering with plastic film can increase the temperature by 2-6℃ and avoid freezing injury or freezing injury caused by cooling weather. The newly planted seedlings can support a part to prevent the top of the seedlings from touching the agricultural film.

Add mulch. Covering includes arch shed, straw curtain, straw, etc. Avoid direct contact of cold current with seedlings, and also increase the low temperature and reduce the degree of freezing injury.

3. Use various measures to raise the temperature. Vegetables grown in the open field can be piled up with straw, wheat bran and rice bran. In many places before the cold wave, it stays bright until the next morning 10. The purpose of this operation is to increase the surface carbon dioxide concentration and surface temperature. Carbon dioxide is a kind of greenhouse gas, which can raise the temperature of the plot area by 3-4℃ and prevent the leaves from freezing.

In all kinds of greenhouses and light-filled greenhouses, after encountering low temperature, cover them with grass curtains or other coverings as much as possible to reduce the temperature loss in the greenhouse and shorten the ventilation time. After the sun came out, the lid was opened in time, and the temperature in the shed rose rapidly. If the temperature in the shed is low, you need to use a heating furnace, a kilowatt bar, an electric heating wire, etc. You can also use the smoke machine to spray or ignite the smoke agent, increase the concentration of carbon dioxide, and prevent and control vegetable diseases and insect pests at the same time. The effect is very good.

Lowering the watering temperature will lead to the temperature drop and the ground temperature drop. If water is added to the soil at this time, the temperature drop will be intensified. If the soil is too dry, a small amount of water can be used to promote root growth, but the water temperature should not be lower than 25℃, and flooding should be avoided.

After transplanting the seedlings with supplementary nutrition, the roots began to tie up and needed some nutrition. Generally, nitrogen fertilizer and potassium fertilizer are mainly used. Plant ash can be applied, and decomposed human excrement can also be applied together with watering. If the seedlings show symptoms of fertilizer deficiency, urea and potassium dihydrogen phosphate can be sprayed on the leaves to resist the low temperature.