Before determining the space between greenhouses, it is still necessary to carry out relevant popular science knowledge in the greenhouse industry. This is very necessary for ordinary users. The term "greenhouse" is just a colloquial expression in daily life. There is no such type in the greenhouse industry, but in the greenhouse industry, it is generally divided into three categories by name, namely spring and autumn greenhouses, solar greenhouses and multi span greenhouses. ▲ Spacing between solar greenhouses of different greenhouse types In the practical application of greenhouse, the space between greenhouses is mainly considered whether there is shelter, which affects the lighting of crops in the greenhouse. In fact, there are three different types of greenhouses, which have a large gap in terms of light shielding. Spring and autumn greenhouses and multi span greenhouses have a common feature, that is, they are all made of transparent covering materials, which is relatively low for the sunlight shielding of the front and rear greenhouses. The solar greenhouse is different. Its biggest feature is that it has a wall, which can be said to be 100% sunshade. During the construction of the solar greenhouse, the distance blocked by the back wall directly affects the position of the greenhouse behind. ▲ The space between greenhouses in spring and autumn is very small ① Spring and autumn greenhouses and multi span greenhouses also need a certain distance directly For the covering materials of these two greenhouses, although they are transparent. From the perspective of light transmission, the influence of sunlight on plant growth can be ignored. However, there must be a distance between greenhouses, which is mainly related to the practical application of greenhouses, especially when the length of greenhouses is relatively long. For the materials that need to be transported for planting crops in greenhouses, there should be a corr

Intelligent planting of agriculture by using Internet of Things technology has become a hot spot. Intelligent information management technologies such as intelligent greenhouse monitoring system are the mainstream of modern agriculture development. Domestic smart greenhouse management is still extensive At present, some smart greenhouse demonstration bases emerging around the country rely more on greenhouse environment control methods based on set values. The main control methods are as follows: first, set the target parameters (such as indoor temperature, humidity, light, etc.) based on experience, the controller makes decisions based on the gap between the detected real-time results and the target parameters, and achieves the target value by adjusting the opening and closing of the equipment through the environment. This is a relatively extensive intelligent management mode widely used in domestic greenhouses at present. To a certain extent, it is just the use of computers instead of human hands to press the switch, which cannot be regarded as real intelligence. Let plants "speak" Modern facility agriculture is good at effectively regulating crop growth environment, and the primary task of regulation should be to understand crop demand. It is to truly perceive when plants are hungry, thirsty, fat or thin; What temperature does it need for vegetables? When should I water it? When should I fertilize? How much water? How much fertilizer? All problems are clear at a glance. Then precise control will be carried out according to the actual needs of its growth. To understand plant "language", the secret lies in plant life information perception technology. To achieve "dialogue" with plants, it is necessary to accurately and effectively collect soil nutrients, meteorological environment, plant nutrition, growth data, etc. that affect plant growth. Smart greenhouse needs real "super brain" Intelligent de

There are many kinds of films suitable for solar greenhouse. According to the different resin raw materials, it can be divided into polyethylene (PE) film, polyvinyl chloride (PVC) film and vinyl acetate (EVA) film; According to its performance characteristics, it can be divided into ordinary film, long-life film, drip free film, long-life drip free film, diffuse reflective film, composite multi-functional film, etc. The properties of these films have their own characteristics and strengths. Combined with the current production needs, this paper introduces several commonly used films for reference when building greenhouses. Types and characteristics of films (1) Polyethylene ordinary film (PE) The light transmittance of the new film is about 80%; Weak dust absorption, without the phenomenon of excessive dust absorption (tackiness) caused by plasticizer precipitation of polyvinyl chloride (PVC) film. It has strong low temperature resistance, low temperature brittleness is - 70 ℃, and it can still maintain softness at - 30 ℃. The relative density is 0.92g/cm3, and the infrared transmittance is more than 70%. The heat preservation performance at night is poor, not as good as PVC film. The fog drop property is heavy, and the weather resistance is poor. The service cycle is 4-5 months. It is not sun resistant, and the high temperature softening degree is 50 ℃. Therefore, it is not suitable for covering cultivation in high temperature season. It can be used for covering cultivation in early spring and late autumn. It is not easy to bond after tearing. At present, there is no suitable repair adhesive, and it can only be heat sealed when splicing. (2) Polyethylene long-life film It is made of polyethylene as the base resin by blowing after adding a certain proportion of ultraviolet absorber, anti-aging agent and antioxidant. The weather resistance is good, and the service life is 1.5~2 years. The thickness is 0.1~0.12 mm, the amount