Does the black and white film used on the greenhouse have a cooling effect in summer?

There are two sides of the black and white film in the greenhouse, one is pure white and the other is black, which is generally used as a shelter for the greenhouse, and the white side will be facing up. Greenhouse black and white film is a multi-purpose new type of agricultural film, which plays a protective role in the growth of plants, and the greenhouse black and white film can be used in many greenhouses such as chicken houses, pig houses of the shade cover, can play a better role in sun protection.

First, which side of the black and white film of the greenhouse is facing up.

1. The black and white film of the greenhouse is bright white on one side, and black on the other, which is characterized by tensile resistance and extensibility is particularly good, the pure white side has the characteristics of reflection and sun resistance, and the black side has the effect of heat absorption and heat preservation, so the general white side is facing up, which can effectively control the high temperature.

2. The black and white film of the greenhouse also has the characteristics of leakage prevention and seepage-proof. Therefore, the new greenhouse black and white film is a multi-functional, multi-purpose new agricultural film, which plays a protective role in the growth of plants.

3. Black and white film can be widely used in various edible fungus greenhouses, sericulture greenhouses, flower shading, light (and adjustment of flowering period), aquaculture shed covering, hydroponic cultivation impermeable layer, greenhouse outer layer insulation, anti-freezing, vegetable greenhouse mulching, green fodder storage, chicken house, pig house and so on.

Second, what are the advantages and disadvantages of black and white film in greenhouses.

1. Advantages. 1) The advantage of the black and white film of the greenhouse is that it has a strong ability to reflect light, prevent the light from penetrating through, play a role in shading and cooling, and the temperature in the greenhouse is much lower than that covered by other tarpaulins and films.

2) The cooling effect of the black and white film of the greenhouse is much better than that of the shade net, and the requirements for the greenhouse are relatively low, and the service life will be longer.

2. Disadvantages. The main disadvantage of greenhouse black and white film is that it is not very expensive, because its production cost is relatively high, and it is also more widely used, so it will be more expensive.

The black and white film has a cooling effect in summer, the white side reflects the sunlight outward, and the black side faces inward to control the light transmittance, and the temperature in the shed is much lower than that of other tarpaulins and film covers.

PEP black and white film originated from European Greek agricultural film manufacturers, is the leader of high-end agricultural film technology in China, the company took the lead in the production of agricultural film to master and use the three-layer co-extrusion technology, exquisite production technology and technology, so that the quality of the film is more reliable!

Second, the raw materials used in the production of PEP black and white film are all imported from Greece, and the products are produced by the international advanced three-layer co-extrusion machine imported from West Germany, with a width of up to 20 meters and a length of 200-500 meters, which can meet the needs of various structural greenhouses.

3. This product is black on one side and white on the other, and the white side is outside and the black side is inside when used. The white side is added with antioxidants and reflective materials to prolong the service life and reflect the light, and the black side blocks the light to achieve the effect of light breaking, and the two can play a role in the use of light breaking, cooling, sun protection, warm in winter and cool in summer!

Fourth, the light-off and sunscreen effect of PEP black and white film not only provides a better growth environment for poultry breeding, but also effectively protects the insulation materials on the breeding greenhouse from being exposed to the sun, increases the service life of these materials, and also saves costs for you.

Summary. 1. White mulch film is better. First of all, it is necessary to understand the respective characteristics of white mulch and black mulch. The white mulch film has strong light transmittance, so the ground temperature rises quickly, and it is suitable for vegetables cultivated at low temperatures, such as overwintering stubble;

2. The black mulch film has poor light transmittance and slow ground temperature rise, but it has strong heat preservation and night temperature release ability, and can inhibit the growth of ground weeds and reduce ground temperature, so it is more suitable for vegetables cultivated at high temperature, such as summer cultivation and autumn delayed cultivation.

1. White mulch film is better. First of all, it is necessary to understand the respective characteristics of white mulch and black mulch. The white mulch film has strong light transmittance, so the ground temperature rises quickly, and it is suitable for vegetables cultivated at low temperatures, such as overwintering stubble; 2. The black mulch film has poor light transmittance and slow ground temperature rise, but it has strong heat preservation and night temperature release ability, and can inhibit the growth of ground weeds and reduce ground temperature, so it is more suitable for vegetables cultivated at high temperature, such as summer cultivation and autumn delayed cultivation.

The temperature difference between the black and white film and the ordinary film greenhouse is about 5 to 10 degrees.

PEP black and white film** is lower than ordinary white film + shade net, but the life span is 3 5 times longer, and the temperature is 5 10 times lower in summer. The long service life reduces the frequency of film replacement and greatly reduces labor costs. The average annual cost of PEP black and white film is much lower than that of domestic black and white film**, but the service life is more than 3 times that of domestic black and white film.

The temperature of the plastic greenhouse is mainly determined by what vegetable cash crops are planted by the planting users, and the general planting users will keep the greenhouse plastic greenhouse at about 25 degrees, so that there is no problem with the growth of most vegetable cash crops.

Summary. This depends on the type and material of the whitened greenhouse film. In general, the whitening of the surface of the film will reduce the temperature of the film under direct sunlight by about 2-5 degrees, which helps to avoid the damage caused by the high temperature of the plant in summer, wetting, accelerating the first decline of the plant body, reducing the chlorophyll extinction (bleaching) of the plant body, so as to obtain higher yields.

In addition, the whitening of the greenhouse film can also effectively reduce the development and movement of the leaf insulation layer, so as to prevent the leaf from condensing water in the case of summer rain, so that the moisture of the roots can be maintained to a certain extent, thereby reducing the reproduction and occurrence of plant decay and animals in the greenhouse. In addition, the whitening of the greenhouse film can also reduce the incidence of UV ultraviolet rays, thereby preventing the occurrence of root diseases and reducing the appearance of pests and diseases in the greenhouse, so as to maintain and improve the environment in the greenhouse.

This depends on the type and material of the whitened greenhouse film. In general, the whitening of the membrane surface will reduce the temperature under direct sunlight by about 2-5 degrees, which helps to avoid the damage caused by excessive temperature in the summer, wetting, accelerating the first decline of the plant body, reducing the chlorophyll extinction (bleaching) of the plant body, so as to obtain higher yields. In addition, the whitening of the greenhouse film can also effectively reduce the development and movement of the leaf insulation layer, so as to prevent the leaves from condensing water in the case of summer rain, so that the humidity of the root of the key stove can be maintained to a certain extent, so as to reduce the reproduction and occurrence of plant decay animals in the greenhouse.

In addition, the whitening of the greenhouse film can also reduce the imitation radiation of UV ultraviolet rays, so as to prevent the occurrence of root diseases and reduce the appearance of pests and diseases in the greenhouse, so as to maintain and improve the environment in the greenhouse.

That is, the greenhouse crop is cherry, and the film is white in summer, and it has no effect on the tree, right?

Yes, the greenhouse film coating Tongtong Hall Zen white has no effect on the tree, because it can help reduce the temperature, prevent leaf agglomeration and other problems, and then reduce the occurrence of disease dust and insect pests, so that the plant yield increases. It can also prevent UV light from irradiating the roots, reduce root insect infestation, and promote the growth and development of waiting plants.

Summary. The greenhouse overwintering cover black mulch film is good, and it can absorb a lot of heat and increase the temperature when there is sun, and the white heat absorption is poor.

Is it better to cover the green stubble with black mulch, or is it better to be white and transparent? Is it better to use black film or white film for greenhouse wintering stubble.

The greenhouse overwintering cover black mulch film is good, and it can absorb a lot of heat and increase the temperature when there is sun, and the white heat absorption is poor.

What is the impact of a cloudy and snowy day?

White and black are the same on rainy days, nothing changes, give up the warm weather, black absorbs a lot of energy, and it is easy to raise the temperature.

What are the disadvantages of using black film in the summer.

It's definitely not good, the energy absorption is too large, and the temperature inside is too high.

Tomatoes have yellow seedlings and soft fruits during the ripening period.

Oh, yes, I'm not very professional in tomatoes, I'm farming, there should be professional staff to give you an answer, you go and ask, I'm sorry.

In winter, when vegetable farmers cover the mulch, some choose white mulch, and some use black mulch. What kind of mulch film is better?

The most important thing in winter is to improve temperature and heat preservation, and the heat retention of black mulch film is not as good as that of transparent mulch. The main reason for choosing black mulch is that we are afraid of weeds growing in the shed, and transparent mulch does not have the function of weeding. But in winter, the temperature is so low, there is very little grass under the mulch, and even if the grass grows, it will not grow, so there is no need to lay black mulch for this.

The effect of the two kinds of mulch film on the ground temperature under the film is different, and in general, the ground temperature is higher when using transparent mulch. Transparent plastic film has high light transmittance, generally 80 -93 8, light is converted into heat on the soil, and the ground temperature can still be effectively increased after the plastic film is propped up, and the vegetables are slow and fast. The black mulch film is opaque, and the light is converted into heat on the mulch, mainly spreading upward, and the heat conduction is not smooth after the mulch film is propped up, and the ground temperature is relatively low.

According to the test, on nightshade vegetables, the yield can be increased by about 30% in the early stage with transparent mulch film 5-6 days earlier than that of black mulch vegetables.

It depends on the geographical location, lighting, and scale of your greenhouse