First, increase the height of the greenhouse. In order to increase the utilization rate of greenhouses, the span of greenhouses has generally been increased, from the previous 7.2 meters to 8 to 9 meters, but the height of the shed has not changed, which reduces the angle of the roof lighting, making the lighting performance of the greenhouse decreased. The height of the greenhouse should be increased. The general shed is 8 to 9 meters in length, and the shed height should be 3.2 to 3.5 meters. Second, improve the roof. The elevation angle of the roof should be increased to 35 to 38 degrees, and the back slope cover should be thickened. The covering material should be no less than 30 to 40 cm thick. In addition, it is best to cover the fascia with the north wall of the back wall to protect the wall and facilitate the pulling of the grass. ?? Third, set the cold ditch. In the front of the greenhouse, dig a trench of 40 cm in width and 50 cm in depth, filled with rotten grass, and covered with a cover; The cold-proof ditch can cut off the heat exchange inside and outside the greenhouse and prevent the frozen ground from extending into the shed. ??four. Improve the quality of lids. It is best to use a new grasshopper for 1 to 2 years. The thickness of the grasshopper is 4 to 5 centimeters. It is tightly airtight and covered with cross-covers. Deep winter season advocates double coverage. That is to say, a layer of 0.06mm ordinary plastic film is covered on the grasshopper, which can not only increase the insulation performance, but also solve the problem of rainy weather. Fifth, the application of grafting technology. Grafting cultivation can overcome the obstacles of continuous vegetable cultivation and enhance its resistance to disease and stress resistance. Sixth, the full implementation of plastic film. In greenhouse vegetable production, reducing and controlling the humidity in the greenhouse is an important measure to prevent various diseases. With full membrane coverage, not only can the ground temperature be raised, the humidity in the greenhouse can be controlled, but also the scattered light in the greenhouse can be increased, the growth of vegetables can be promoted, and the yield can be increased. VII. Hanging a reflective screen. Insufficient light is an important factor that restricts the increase of vegetable yield in greenhouses. Hanging the curtain of reflection is one of the effective ways to increase the illumination in the shed, especially for making up for the lack of illumination in the rear part of the greenhouse. Eight, using warm water irrigation. At present, the use of well water in the shed is mostly used in production, which is extremely unfavorable to the growth of thermophilic vegetables in the deep winter cold season. With warm water, the vegetables can be protected from low ground temperature damage. There are many ways to warm water. One of them is to set up a reservoir in the shed. During the specific operation, a suitable reservoir can be dug according to the amount of water required by the vegetables in the greenhouse, and the plastic film can be placed in the pool. The pool can not only perform warm water irrigation, but also can play a role of heat storage and balance the temperature of the greenhouse. If conditions permit, it is also possible to use polyethylene plastic pipe with a diameter of about 10 cm to fill the water and fix it on the back wall with wire. Install 4-6 rows according to the actual amount of water and use an elbow to connect the two adjacent plastic pipes. The placement position should ensure that the light can be seen from 9 to 16 o'clock during the period from light snow to vernal equinox. Watering should be performed at about 2 o'clock noon when the water temperature is highest. Nine, for carbon dioxide fertilization. Carbon dioxide fertilization in greenhouses can significantly increase vegetable production within the shed, with an average yield increase of more than 30%. Ten, using mechanical shutters. When artificial roller blinds are costly, it takes about 1 hour to manually uncover a curtain per mu. If mechanical shutters are used, it only takes 5 to 7 minutes, which greatly shortens the time for uncovering the grass, which is a short time for sunshine. In the winter, it is extremely beneficial to the growth of vegetables in the greenhouse.
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