"Every year in the low temperature season of winter and spring, the vegetables on the face in front of the greenhouse are generally inferior and are more susceptible to infection and cold damage. Is there a good solution?" Recently, a vegetable farmer called for help urgently.
The front face of the greenhouse is small, the heat dissipation area is large, and the temperature is fast. Especially when using the roller shutter machine, the overall rolling of the roller shutter machine is not coordinated. Will cause the front face to be cooler. In addition, the water drops inside the shed film dripped on the front face, causing excessive humidity. In this way, the environment with drastic temperature changes and high humidity often causes abnormal growth of vegetables on the front face, and the yield is also reduced. The author visited and found that many vegetable farmers have thought about many methods for the insulation of the front face of the greenhouse, and the results are good.
Two membranes are set inside the front face of the greenhouse
Setting two films on the inside of the front face can not only reduce heat loss and increase the temperature in the shed, but also help to isolate the wet soil on the front face, reduce the humidity of the front face in the shed, and reduce the occurrence of diseases. Two films can be used without dripping film, less dew, and good thermal insulation. You can also use mulch, the most economical. When setting the second film, the second film should not be close to the outer shed film, and it should be 20-30 cm away from the outer shed film, which is conducive to the increase of temperature and isolation of moisture. When the night temperature in the shed is between 16 ° C and 17 ° C, the inner two membranes can be set at half the height of the front face, which can increase the temperature during the day and night without affecting the light transmission of the front face. When the night temperature in the shed is between 15 ° C and 16 ° C, the temperature at the front face will drop to 12 ° C to 13 ° C. At this time, the second film should be set at the same height as the front face to enhance the heat insulation.
Add non-woven fabric or old straw curtain to the front face of the greenhouse
Adding non-woven fabrics or old straw curtains to the front face of the greenhouse is like putting an "apron" on the greenhouse. This layer of non-woven fabric or old straw curtain covered when being put on the shed is covered under the insulation quilt, which can greatly enhance the effect of heat preservation on the front face of the shed. The texture of the non-woven fabric is soft. The height of the non-woven fabric should be higher than that of the front face. The non-woven fabric should be tied to the pressing film first, and then the insulation can be put down. When using an old straw curtain, the height of the old straw curtain should be lower than the height of the front face of the shed, and it can be set to more than one-half of the height of the front face. In this way, when the roller shutter reaches the front face, the drop from the ground is smaller. Large, the roller shutter iron will soon land at the bottom of the front face. If it is the same height as the front face, it is easy to overwhelm or hold up the old straw curtain, and it will not be able to maintain heat. The main purpose of covering the front face of the greenhouse with this layer of non-woven fabric or old straw curtain is to enhance the insulation at night. Therefore, after the shed is opened the next day, it should be removed in a timely manner to facilitate the light transmission of the front face and avoid the front face. Vegetables cause shading.
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