First: Choose according to the type of cultivation. Some plants grow with high light intensity requirements, while others are weaker. For example, a tomato is a plant with a higher light requirement. There are two kinds of shade nets currently on the market, one is a black shading net and the other is a silver-gray shading net. There are differences in light transmittance between the two shade nets. The black shading net has a high shading rate, and has a relatively good cooling effect. It is suitable for short-term cover-up during summer heat. The silver-gray shade net has a refractive index of 45 percent, which, together with the shade, can satisfy the growth of hi light plants.
Second, use based on hidden time. The concealment of the shade net should take into account the manipulation of the time period. For example, the air temperature is low in the morning and in the evening, and it is possible to use the shade net only when the high temperature is at noon. Rainy days cannot be used because there is no sunlight. In addition, when covering the shade net, it should try not to be close to the exterior of the greenhouse to avoid the heat absorbed by the shade net from entering the greenhouse through the external surface of the membrane.
Spray cooling device
Spray cooling equipment has a good cooling effect, using a low-level strength. The principle is that after the water is added to the high-pressure micro-mist nozzle, ultra-fine particles of water mist are generated. In the future, these water mists can rapidly absorb the heat existing in the air and transpire and continue the process of heat absorption and transpiration. Makes the ambient temperature drop, reaching the cooling effect. In addition, the use of spray cooling equipment in the greenhouse can maintain the air humidity in the greenhouse, adhere to the plant's moisture content, and promote growth.
The plastic film used in the construction of vegetable sheds will become old and damaged in the future. Many cultivation habits cover the changed film from scratch to a new greenhouse, as a way to cool down. The transmittance of the old plastic film has decreased, which can obstruct some of the sunlight, but it does not completely obstruct the sun. Masking more films can only reduce the ventilation power of the greenhouse and can not reach a useful cooling effect. In addition, if the film is lax, it can be easily blown by the wind.
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