How to keep plastic greenhouses insulated

Plastic greenhouse is a simple and practical protective ground training facility, because of its easy construction, easy to use, less investment, with the development of the plastic industry, is widely used by countries in the world.

The plastic greenhouse makes full use of solar energy, has a certain thermal insulation effect, and can adjust the temperature and humidity in the shed within a certain range through the tired film. Therefore, the plastic greenhouse in the northern region of our country, mainly play the role of spring in advance, autumn postponement after the insulation cultivation, generally spring can be 30-35 days in advance, autumn plum can be postponed 20-25 days, but can not carry out overwintering cultivation; In the southern region of our country, in addition to the winter and spring for the insulation and overwintering cultivation of vegetables and flowers, the plastic greenhouse can also be replaced for the shading and cooling of the summer and autumn seasons and the facilities for rainproof, windproof, hail and other facilities for cultivation.

China's vast territory, complex climate, the use of plastic greenhouses for vegetables, flowers and other facilities for cultivation, to alleviate the contradiction between supply and demand of vegetables in the off-season has played a special and important role, with significant social benefits and real huge economic benefits.

During the day, the plants absorb heat and release it at night, while the plastic greenhouse has no breathable effect, which releases the heat of the plants, thus playing the role of heat preservation.

1. Choose good building materials, absorb heat during the day, and dissipate heat at night. 2 Now that the technology is very mature, the temperature can be adjusted through lamps, instruments, etc.

Several functions, plant exothermy, sun irradiation, the key is poor ventilation, heat is not easy to dissipate.

The respiration of the plant releases heat, and it is enough to cover it with a straw coat at night.

The plastic greenhouse is sealed and breathable, so it can keep warm and moisturize to create a microclimate.

Excellent sealing performance can reduce heat dissipation.

The plastic greenhouse makes full use of solar energy, has a certain thermal insulation effect, and can adjust the temperature and humidity in the shed within a certain range through the roll film. Therefore, plastic greenhouses in the northern region of China, mainly play the role of spring in advance, autumn after the insulation cultivation, generally spring can be 30-35 days in advance, autumn can be delayed 20-25 days, but can not be overwintered; In the southern region of our country, in addition to the winter and spring for the insulation and overwintering cultivation of vegetables and flowers, the plastic greenhouse can also be replaced for the shading and cooling of the summer and autumn seasons and the facilities for rainproof, windproof, hail and other facilities for cultivation.

China's vast territory, complex climate, the use of plastic greenhouses for vegetables, flowers and other facilities for cultivation, to alleviate the contradiction between supply and demand of vegetables in the off-season has played a special and important role, with significant social benefits and real huge economic benefits.

Plastic greenhouse, commonly known as cold shed, is a simple and practical protected land cultivation facility, because of its easy construction, easy to use, less investment, with the development of the plastic industry, is widely used by countries around the world. The use of bamboo, steel and other materials, and covered with plastic film, to build an arched shed, for the cultivation of vegetables, can be early or delayed, improve the yield per unit area, is conducive to the prevention of natural disasters, especially in the northern region in early spring and late autumn off-season**.

The plastic greenhouse can make full use of solar energy, has a certain thermal insulation effect, and adjusts the temperature and humidity in the shed within a certain range through the roll film. Increase the temperature and humidity in the shed. The temperature of the general plastic greenhouse can be increased by 2 5 compared with the temperature of the open field, and the maximum temperature can be increased by 6 8; Increase humidity by 7% to 13%.

Therefore, the plastic greenhouse seedling is conducive to the germination, cuttings and rooting, and can prolong the seedling growth period, and can prolong the growth time of 1 month under the condition of no heating.

The main function of plastic greenhouses is to create a greenhouse effect. In the winter when the weather is cold, vegetables and plants can have a more fashionable and good growing environment.

Multi-layer covering: Build a small arch shed in the shed, and cover the greenhouse with straw and straw around the greenhouse. Mulch:

Cover the crops in the shed with black mulch film to increase the soil temperature. Install laser grow lights: increase the light duration of the crops and set up reflective curtains.

Ridge cultivation: Ridge cultivation with a width of 30 cm and a height of 20 cm for crops.

1. Multi-layer coverage

Winter plastic greenhouse insulation can take the method of multi-layer covering, first in the plastic greenhouse with bamboo poles and plastic film to build a small arch shed, and on the inside of the plastic greenhouse, with plastic film to build a second layer of curtain, and to be around the greenhouse, cover straw, straw and other warm materials, the height of about 1 meter, can effectively increase the temperature of 3-6 degrees.

2. Cover with mulch

The plastic greenhouse itself has a certain degree of warmth, if you want to increase the temperature in the shed, you can cover the crops with black mulch, black has light absorption, and the sealing of the mulch film is good, it can create a warm environment for crops, increase the soil temperature by 2-3 degrees, and play a role in keeping warm, but after using mulch film, you can not water frequently, so as not to evaporate the water and breed germs.

3. Install laser grow lights

In winter, laser grow lights can be installed in the plastic shed to keep warm, laser grow lights can replace sunlight and provide light for plants, so as to improve the cold resistance of crops, and polyester aluminized film can be used in the greenhouse to build a reflective curtain, which is conducive to enhancing the light and increasing the temperature in the shed by 3-4 degrees.

4. Ridge cultivation

The effect of heat preservation can also be achieved by ridge ridge in plastic greenhouse, because the surface area of the ridge is larger, which can absorb light to a greater extent and increase the soil temperature, so that the temperature in the shed rises, but when ridge the crop, the height of the ridge should be kept between 15 cm and 20 cm, and the width is about 30 cm.

First. Sweep the canopy film and increase sunlight:

Remove the dust, dirt and snow on the greenhouse film in time, increase the sunshine in the greenhouse as much as possible, and increase the greenhouse temperature;

Second. Foliar fertilizer spraying:

In winter, the temperature is low, the light in the greenhouse is weak, and the absorption capacity of crop roots decreases, so potassium dihydrogen phosphate can be sprayed on the foliar surface, which can increase the sugar content and hardness of the mesophyll, improve the cold resistance of the plant, and alleviate the degree of frost damage. Or use rice vinegar mixed with sugar and superphosphate, prepare 100-300 times of liquid, and spray it on the leaf surface;

Third. Heating Heating:

In case of extremely cold weather, you can add a stove or turn on the heating in the greenhouse, but when using the stove to heat, pay attention to prevent flower gas poisoning, and install a chimney to output the gas outside the shed, and be careful not to ignite firewood and grass in the shed to increase temperature, because the smoke released when the firewood and grass burn is extremely harmful to crops.

Fourth. Plus mulch:

At night, a small shed should be covered with a straw curtain in the greenhouse. At night, add grass or corn stalks around the greenhouse, which can increase the temperature by 1 to 2. Adding a thin layer of tomath on top of the original straw can increase the greenhouse temperature by 2 to 3.

Covering the original straw with a film not only blocks the wind, but also prevents rain and snow from wetting the straw, thereby reducing heat loss due to water evaporation. For the flowers planted in the ground, it can also be covered with plastic film, and the soil temperature can be increased by more than 1 after mulching;

Fifth. Cultivating and cold-proof:

In winter, the greenhouse floor is compacted, the heat enters the tillage layer during the day is restricted, the soil heat storage energy is less, and the cracks in the compacted soil are large and deep, the aggregate structure is poor, and it is easy to lose heat in the first half of the night, and the temperature is low in the second half of the night, which is easy to cause frost damage. Shallow tillage can break the ground cracks when it is ventilated, which can not only control the transpiration of groundwater to take away heat energy, but also keep warm and cold and protect seedlings;

Sixth. The walls are blackened:

The inner surface of the back wall and side wall of the greenhouse is blackened with cement and black pigment, which can enhance the heat absorption capacity of the wall and effectively increase the greenhouse temperature;

Summary. Dear, hello, the insulation method of the winter plastic greenhouse is as follows: 1. How to insulate the winter greenhouse with thickened walls, if the temperature is relatively low or the cooling is relatively fast, it may be because the thickness of the wall is too thin, so that the indoor hot air continues to overflow and cannot keep warm, you can thicken the wall of the greenhouse about double, and use transparent plates to make an insulation layer in the wall to keep warm. 2. Replace the board usually in the roof of the greenhouse The insulation materials used are traditional materials such as wheat straw or straw, although the thermal insulation ability is good, but it is relatively light and easy to be blown away by the wind and easy to degrade and rot, and the warmth effect is getting worse and worse, it can be replaced with emerging thermal materials such as polystyrene board, which are staggered and stacked on the roof to play a role in heat preservation.

3, the construction of the cold-proof ditch is also a more important part, the construction of a good can greatly help the temperature in the house rise, generally in front of the greenhouse to dig out the depth of about meters, the width of the ditch, the length and the length of the greenhouse can be consistent, in which to fill some insulation materials, can raise the indoor temperature of 5 degrees Celsius.

Dear, hello winter plastic greenhouse insulation methods are as follows: 1, thicken the wall of the winter greenhouse how to insulate the winter greenhouse If the temperature is relatively low or the cooling is relatively fast, it may be because the thickness of the wall is too thin, so that the indoor hot air continues to overflow and can not keep warm, you can thicken the wall of the greenhouse and grind it quietly, and use transparent plates to make an insulation layer in the wall to keep warm. 2. Replace the board usually on the roof of the greenhouse The insulation materials used are traditional materials such as wheat straw or straw, although the thermal insulation ability is good, but it is relatively light and easy to be blown away by the wind and easy to degrade and rot, and the warmth effect is getting worse and worse, it can be replaced with emerging thermal materials such as polystyrene board, which are staggered and stacked on the roof to play a role in heat preservation. 3, the construction of the cold-proof ditch is also a more important part, the construction of a good can greatly help the temperature in the house to rise, generally in front of the greenhouse to dig out the depth of about meters, width of the ditch of the ditch, the length and the length of the greenhouse can be consistent, in which to fill some insulation materials, can raise the indoor temperature fiber noise 5 degrees Celsius.

4. Fermentation and warming organisms will also release heat when they are decayed and fermented, and this point can be used to create a heat source to maintain the temperature of the greenhouse, and the organic matter such as straw and raw fertilizer of crops will be stacked and stacked in a tic-tac-toe shape, and the heat will be released through the biological reaction of organic matter such as straw, so as to improve the temperature of the greenhouse inside the big noise round shed.

After covering the film, the turbidity in the greenhouse will increase with the increase of the outside temperature and decrease with the decrease of the outside temperature. There are also significant seasonal variations and large temperature differences between day and night. The lower the temperature period, the greater the temperature difference.

Generally, the daily warming in the greenhouse in the cold season can reach 3 6, and the heating capacity on cloudy days or at night is only 1 2.

In the warm spring season, the temperature difference between the shed and the open field gradually increases, and the temperature increase can reach 6 15. When the outside temperature rises, the temperature increase in the greenhouse is relatively increased, up to more than 20, so there are high temperature and freezing hazards in the greenhouse, which need to be manually adjusted. In the high temperature season, more than 50 high temperatures can be generated in the shed.

The whole shed is ventilated, and the outside of the shed is covered with straw curtains or erected"Pergola", which can be 1 2 cooler than the open field. In winter, when it is sunny, the minimum temperature at night can be 1 3 higher than that in the open field, and on a cloudy day, it is the same as in the open field. Therefore, the main production season of greenhouses is spring, summer and autumn.

Through thermal insulation and ventilation cooling, the greenhouse temperature can be maintained at 15 30 growth temperature.