How to prevent freezing vegetables in greenhouses

Adding farm manure with warm manure such as pig manure or earth miscellaneous manure, cultivating in the roots of vegetables, can increase the soil temperature of the root 2 °C -3 °C, the application should be carried out on a sunny day, 1000-1500 kg per acre Shi.

Soil surrounding the roots before the soil is combined with the cultivator before the soil is frozen, and soil is used to encircle the roots, which can loosen the soil, raise the soil temperature, and can directly protect the roots. However, the cultivating soil must be carried out before the soil is frozen. The depth should be 5-10 cm.

Foliar Fertilizer The foliar vegetables are sprayed with 1-2 times 0.2% potassium dihydrogen phosphate solution on the foliage, which can not only supplement the plant nutrition, but also enhance the cold resistance.

Cover the straw in the afternoon before the onset of the frost, cover the vegetables and vegetables with wheat straw, etc., to reduce the cold damage, use 100-150 kilograms of straw per acre, to be scattered, not to cover all the vegetables, so as not to affect their photosynthetic effect.

Before the advent of low-temperature freezing of straw ash, a thin layer of ash is applied on the vegetables and between the rows, which is conducive to heat preservation.

Irrigation and irrigation irrigation can increase soil heat capacity and prevent soil temperature from falling, but keep in mind that irrigation should not be performed during the freezing period.

Smoke, cold, weeds, straw, litter, etc. piled up piles, fire smoke before the advent of frost, can disperse the cold.

During the daytime, the transparent cover is fixed so as not to be blown by the wind. The cover is tight at night and properly covered. If necessary, the mane rake, grasshopper, etc. are pressed well. Otherwise, once the wind blows off, the seedlings are extremely vulnerable. freeze.

Rainproof insulation Insulation during the daytime rain, promptly peeling off the cover, preventing the beddings of grasshoppers, grasshoppers, etc. from being affected by the rain, affecting the insulation effect, but be careful not to make the rain splashed into the chamber; at night, rain, after the rain, grasp the time to cover Sun dried.

Anti-snow insulation should be covered with mane rakes, which are covered with grass rakes. Snow is removed immediately after the snow stops. Night snowfall, snow rushing after the snow stop on the second day in the morning, the cover is kept dry, and the cover is removed in time. Things make seedlings see light. After the continuous cloudy snow weather suddenly cleared, after removing the cover, pay attention to observing the seedling changes, find the wilt, immediately cover it with a bristle, recover and then uncover, wilt and then cover, so repeated, after 2-3 days It can be transferred to normal management; if it is uncovered, it will easily result in "down seedlings."