Protecting vegetables against freezing

Most vegetables are more sensitive to low temperatures, and cold weather and freezing rain, snow, and other bad weather are often encountered in the production of protected vegetable in winter. Improper protection will cause great economic losses and measures should be taken to prevent it as soon as possible.

Irrigation Antifreeze Irrigation of vegetable fields before the onset of frost and severe cold can prevent a significant drop in the ground temperature and reduce the degree of frost damage, especially for the prevention of dry freezing. To be poured, pouring, with no water for the degree. After catching water, grab a favorable opportunity to raise the ground temperature.

Dig out the cold ditch to dig the cold-proof ditch around the protection site. The depth is to excavate the permafrost as a degree, and the width is 50 to 70 cm. Fill the sawdust, straw, etc. in the ditch. The top cover is solid, making it slightly higher than the ground.

Adding light to the back wall of the booth to hang a reflective film to increase the light intensity; or install electric lights in the shed to turn on the light in the morning and evening for 3 hours in the morning and in the evening in order to increase the temperature in the greenhouse and promote plant photosynthetic activity. effect.

Adjusting the air content In winter sheds, the temperature is low, and there is little ventilation and ventilation. This can easily lead to excess oxygen and insufficient carbon dioxide, which is not conducive to photosynthesis of plants, resulting in reduced cold resistance. Smoke can be supplemented with fumes, sulfuric acid and ammonium bicarbonate.

After the snow, the management of the snow-covered weather is relatively chilly. When the temperature is around -10°C, the temperature inside the shed is generally around 16°C. The temperature difference between the inside and outside of the shed is small. After the weather is clear, the shed temperature in the noon can rise above 30°C. The temperature difference between the interior and exterior of the shed is close to that of cloudy snow days, and then the temperature is gradually increased. The plants gradually adapt to the environment to restore normal growth.

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