At present, sunshade net is mainly used in summer, especially in the south. It has been described as white in winter and black in summer in the south. In summer, it has become a major technical measure for disaster prevention and protection to use sunshade net to grow vegetables in south China. At present, the application in north China is limited to summer vegetable seedling. In summer (June-August), the main function of covering sunshade net is to prevent the exposure of hot sun, the impact of heavy rain, the harm of high temperature, the spread of diseases and insect pests, especially to prevent the migration of insects play a very good role.
After covering in summer, it plays a role of blocking light, rain, moisturizing and cooling. After winter and spring mulch, there is a certain effect of heat preservation and humidification. Sunscreen is the use of polyethylene (HDPE), high density polyethylene, PE, PB, PVC, recycled materials, new materials, such as polyethylene propylene as raw materials, by ultraviolet stabilizer and oxidation prevention treatment, with strong tensile resistance, aging resistance, corrosion resistance, radiation resistance, light and other characteristics. It is mainly used for the protective cultivation of vegetables, fragrant buds, flowers, edible fungi, seedlings, medicinal materials, ginseng, ganoderma lucidum and other crops and the aquaculture and poultry breeding industry, etc. It has obvious effect on increasing the yield.