The shading net is mainly used in summer, especially in the south, where the promotion area is large. Some people have described it as: in the north in winter, it is white (film-covered), and in the south in summer, it is black (covered with sunshade nets). Cultivation of vegetables using shade nets in the south in summer has become a major technical measure for disaster prevention and protection. Northern applications are also limited to summer vegetable seedlings. In summer (June-August), the covering shading nets are mainly used to prevent the sun's rays, prevent the impact of heavy rain, the harm of high temperature, the spread of pests and diseases, especially to prevent the migration of pests.
After summer coverage, it plays a role of blocking light, rain, moisture, and temperature; after winter and spring coverage, it also has a certain heat preservation and humidification effect.