Nowadays, growing crops is almost inseparable from greenhouses. Greenhouse technology can not only improve the ability to withstand natural environmental disasters and resist droughts and floods, but can also advance or delay cultivation, extend the growth period of economic crops, and achieve early maturity, late maturity, increased and stable yields. purpose and is very popular among farmers. Due to different climates and applied research around the world, the specifications of greenhouses also vary. We will introduce and analyze several of the most common greenhouse data types in current society, talk about their advantages and disadvantages, and help friends choose a suitable greenhouse more reasonably.
1.Plastic Greenhouse
Large-scale multi-span plastic greenhouse is a greenhouse type that has appeared in the past decade and has achieved rapid economic development among enterprises. Compared with glass greenhouses, it has the advantages of light weight, less skeleton material, small shading rate of structural parts, low cost, and long service life. Analysis of its environmental management and regulation learning ability basically allows us to achieve the same results as a glass greenhouse at the same time. Living standards, the use of film greenhouses worldwide is far higher than that of glass greenhouses, and has become the mainstream of the development of China’s modern agricultural greenhouse industry.
2. Glass greenhouse
A glass greenhouse is a greenhouse with glass as a transparent covering material. In foundation design, in addition to meeting strength requirements, it should also have sufficient stability and resistance to uneven settlement. The foundation connected to the inter-column supports should also have sufficient horizontal force transmission and spatial stability. The bottom of the greenhouse should be located below the frozen soil layer. The impact of heating on the freezing depth of the foundation can be considered based on climate and soil conditions. The foundation foundation should be more than 0.5 meters lower than the outdoor ground, and the distance between the top surface of the foundation and the outdoor ground should be greater than 0.1 meters to prevent foundation exposure and adverse effects on cultivation. Except for special requirements, the distance between the top surface of the greenhouse foundation and the indoor floor should be greater than 0.4 meters.
3. Solar Greenhouse
The front slope is covered with thermal insulation at night, and the east, west and north walls are single-slope plastic greenhouses, collectively called solar greenhouses. Its prototype is a single-slope glass greenhouse. The front slope transparent covering material uses plastic film instead of glass and evolved into an early solar greenhouse. Solar greenhouses have the properties of good thermal insulation performance, low investment, and energy saving. They are very suitable for use in China’s economically underdeveloped rural areas.
4. Film Greenhouse
The greenhouse covering material is Film, the roof structure of the single-span arch greenhouse. The construction of film greenhouse is easy to use and requires low investment. It is a simple protected land cultivation facility. With the development of the film industry, it is widely used all over the world.
Film greenhouse systems generally rely on the greenhouse environmental effect to accumulate heat without heating the room. The minimum operating temperature is generally 1~2°C higher than the outdoor temperature, and the average operating temperature is 3~10°C higher than the outdoor temperature.
