How to keep warm in winter greenhouses

In order to protect vegetables from low temperature hazards, daylighting is required to increase the temperature of the greenhouse and to provide tight cold protection and nighttime insulation. The protection measures for the automatic greenhouse temperature control machine in winter are introduced below.

The daily trend of greenhouse temperature is similar to that of open field. During the day, when the light is good, if the film is sealed, the temperature of the shed rises rapidly, and the temperature rises badly on cloudy and rainy days. At night, the low temperature in the shed is generally 1-3 degrees Celsius higher than the outside of the shed. The temperature in the temperature chamber is stable than the temperature outside. The temperature in the greenhouse is different, the temperature on both sides is low, and the intermediate temperature is good, so the plants in the middle of the greenhouse grow better than the plants on both sides. From the analysis of the upper and lower parts of the greenhouse, the upper temperature is higher than the lower part in the daytime sunshine, and the temperature difference is large; the night or rainy day is the opposite.

When the temperature in the greenhouse is low, the cover needs to be covered with additional cover. The use of multi-layered film overwintering vegetable cultivation increases nighttime temperature in the greenhouse and low temperature barriers in winter.

Greenhouse automatic temperature control machines generally use three-layer coverings, some of which also require ground coverage. The three-layer cover generally allows the lower night temperature in the shed to be 4.5 degrees higher than the open floor. Covered with straw at night, the shed is well insulated, but the operation is time consuming. Film mulching can increase soil temperature and reduce humidity in the shed. The method of paving the mulch and paving the straw with a shovel has a low cost and a good effect.