How to make greenhouse vegetables survive the winter safely

Pay attention to the indoor temperature and heat preservation. For the shed with less straw curtain, thin back wall and poor thermal insulation, it is necessary to increase the thickness of the straw curtain, use double curtains as far as possible, and cover the straw curtain with rain and snow plastic film to keep the straw curtain dry. If the temperature in the greenhouse is lower than 6 ℃, it should be heated by burning the stove, and cucumber and tomato fruits and vegetables are mainly used to protect roots, seedlings and live.

We should pay attention to the management of continuous cloudy weather. Encounter continuous cloudy days, as long as the temperature is not very low, it is necessary to open the grass curtain, if the sun is exposed for a short time, the temperature in the shed will rise. Hanging a reflective curtain on the back wall of the greenhouse will also increase the light and temperature on a cloudy day. Keep the room temperature not less than 10 ℃ at night, try to store more heat in the back wall on a sunny day, keep the temperature at 25 ℃-28 ℃ during the day, and guard against wind when it is more than 30 ℃. Plastic film should be covered earlier when there are more cloudy days in winter, which can increase the ground temperature and reduce the occurrence of low temperature and freezing injury.

Attention should be paid to the management after a long period of overcast. After a long period of cloudy and foggy weather, once there is a sunny day, the transpiration of vegetables will be strengthened, the root absorption will not keep up, and a large number of seedlings will die after sunny days. After this kind of weather, we should first pay attention to cover the grass curtain to prevent flashing seedlings. After clearing up, the temperature will rise quickly, and the seedlings will wilt sharply. From about 10:00 in the morning, we should pay attention to the changes of seedlings, and take measures such as appropriately covering the grass curtain and spraying clear water into the shed. Secondly, after sunny days, watering as little as possible, the root system must be restored before watering, otherwise it is easy to cause retting roots and dead seedlings. If you need to water topdressing, you should pour small water, with the water into the quick-soluble fertilizer, the concentration should be small. Finally, root-promoting agents were used to irrigate roots after sunny days, and multi-element micro-fertilizers were sprayed on the leaves to make up for the deficiency of root absorption.

The management of snowfall weather. If it snows during the day, you must roll up the grass curtain first. Immediately after the snow stops, clean the snow on the greenhouse film. If the slope in the greenhouse is more difficult to clean, gently scrape it down with a smooth stick and try not to scratch the greenhouse film. If it snows at night, pay more attention to remove the snow on the straw curtain in time, and wrap the straw curtain with plastic film in advance to prevent the straw curtain from absorbing water, otherwise it will cause the shed body to be overburdened and make the arch frame twist or even collapse.

The management of windy weather. When the greenhouse film is bulging, immediately tie the film line or put down part of the grass curtain in the middle of the roof in front of the greenhouse. If you encounter a strong wind at night, it is best to cover a layer of grass curtain on the front foot of the greenhouse and press it firmly with stones.