We should pay close attention to the heat preservation of the shed.

One is to set up a cold-proof ditch in front of the shed. Dig a cold-proof ditch 40 cm wide and 50 cm deep at the front of the shed, fill it with rotten grass, straw, etc., and cover it with film. Setting up the cold-proof ditch in this way can cut off the heat exchange inside and outside the shed and prevent the frozen layer from extending to the shed room, which is an important measure to slow down the temperature drop in the interior of the shed.

The second is to erect corn straw at the back wall of the shed. The shed with thin walls can erect a row of corn stalks along the back wall of the shed in cold weather, which can not only protect the shed, but also play the role of auxiliary heat preservation.

The third is to inspect the shed in time and close the pores as soon as they are found. Do not underestimate the pores in various locations of the shed, these pores convection with the outside air transfer heat, so that heat loss, a great impact on the growth of vegetables. The data show that if the blockage at the door of the shed is not tight, it will be ventilated for 1 hour more than other rooms, and the damage to vegetables can be imagined. Therefore, it is necessary to inspect the shed in time. First of all, it is necessary to check whether there are pores in the greenhouse film and the wall, and should be glued and blocked immediately as soon as it is found. Secondly, we should pay special attention to close the door of the shed, if there are gaps, use dilapidated plastic film, clothes, etc., it is best to hang the thermal insulation quilt at the entrance of the shed to prevent the cold wind from affecting the growth of vegetables.

The fourth is to increase the thickness of grass grass. The thickness of the grass grass used on the old shed should be about 5 cm, which requires the selection of grass grass with tight weaving and less gaps. Otherwise, if the grass grass weave is not closely woven, reveal the gap, cover the shed, the heat preservation effect is very poor. After covering the grass grass, it is also necessary to cover with a layer of plastic film, which can not only enhance the thermal insulation performance of the greenhouse, but also prevent rain and snow from soaking the grass.