There are good ways to increase the temperature of the greenhouse
In the cold winter and spring seasons, the temperature of winter-heated greenhouses tends to be low, which cannot meet the needs of crop growth and development. The low temperature of the greenhouse is a key factor affecting the yield and quality of greenhouse crops. Years of practice have shown that the following simple methods can greatly increase the temperature of the greenhouse and promote crop growth and development.
Replace the film material. Use iron wire instead of bamboo rafts and bamboo chips to support the agricultural film, and use plastic rope instead of bamboo raft as a climbing object, which can effectively reduce the opacity, increase the light intensity of the shed by more than 10%, and increase the temperature of the shed by 1 °C to 2 °C. The photosynthetic efficiency of crops has been significantly improved.
The double-layer cover is used to cover the mulch in the shed, and a small arch shed is added, which has a good temperature increasing effect. Covering the mulch can increase the surface temperature by 2 °C ~ 3 °C, and adding a small arch shed can keep the ambient temperature of crop growth above 15 °C, which is beneficial to meet the temperature required for crop growth and development.
No drop film is used. The drip-free film is not easy to collect water droplets, has good light transmittance, and the light transmittance can reach 98% or more. Since the light transmittance of the drip-free film is high, the chamber without the drip film is used, which is 1 ° C to 3 ° C higher than the chamber temperature of the ordinary shed film.
Repair damaged membranes in time. After the shed film is covered, it should be inspected in time. After the damaged part is found, it will be repaired with the shed film adhesive immediately, so as to avoid the wind and temperature drop, and the crop will suffer from low temperature freezing damage.
Set up the reflective screen. Using aluminized polyester film or smooth thick white paper as the reflective curtain, a wire is pulled on the back wall of the shed, and the reflective curtain is hung on the wire, and the lower end is perpendicular to the ground, which can significantly enhance the illumination of the weak area of ​​the shed. Increase the ground temperature in the shed by about 2 °C.
Add a cold-proof ditch. Dig the cold ditch around the shed, the ditch is 50 cm deep and 60 cm wide. Filled with hot stuff such as wheat bran, sawdust, straw, crushed firewood, and horse dung. After filling, the film is covered and then covered with soil. strict. After a period of time, the heat of fermentation of the hot material can increase the temperature in the shed by 2 ° C ~ 3 ° C, and the temperature increase effect is very significant.
Spread grass ash. Regular application of hay wood ash on the shed floor can effectively inhibit the occurrence of diseases such as vegetable blight, and also play a role in fertilization, moisture control and temperature enhancement. According to the test: in winter, the plant ash is applied three times in the shed, each time 10 to 15 days apart, and the thickness of the application is 2 to 3 cm, which can increase the surface temperature by 2 °C to 3 °C, and the crop yield is about 8%.
Change the irrigation method. Diffusion of traditional large water into drip irrigation or drip irrigation under the membrane can save water by 30% to 50%, and reduce the air humidity in the shed by more than 10%, and the ground temperature is higher by 1 °C ~ 3 °C.
Apply pesticides. To control pests and diseases, powders and fumigants should be used. This kind of pesticide not only effectively avoids the defects of increasing the humidity in the shed and causing the temperature drop due to the spraying of the pesticide, but also is simple and easy, and the effect is long-lasting, and the effect of controlling pests and diseases is good.
Covered with hot stuff. Covering the ground of the greenhouse with a layer of horse manure, wheat bran, leaves, sawdust, and firewood, it has obvious effect of warming and protecting the earth, which can raise the ground temperature by 2 °C ~ 3 °C, and can reduce the watering by 1 or 2 times. .
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