Generally, for leafy vegetables cultivated in winter and spring, the sunshade net is directly covered on the surface of the leafy vegetables (covered by the floating surface) to prevent low-temperature damage. Because of its lightweight, it only needs about 45 grams per square meter. It will not overwhelm, bend, or reduce the commerciality. And because it has certain air permeability, the surface of the leaves is still dry after covering, which reduces the occurrence of diseases. It also has a certain degree of light transmittance, and it will not "cover yellow and rotten" after covering.
Shading nets are mainly used in summer, and the use of shading nets to cultivate vegetables has become a primary technical measure for disaster prevention and protection. Northern applications are also limited to summer vegetable seedlings. The primary function of the sunshade net in summer is to prevent exposure to the hot sun, the impact of heavy rain, the damage of high temperature, and the spread of pests and diseases, especially to prevent the relocation of pests. After covering in summer, it plays a role in blocking light, rain, moisturizing, and cooling; after covering in winter and spring, it also has a certain function of heat preservation and humidification.
Moisturizing principle: After covering the sunshade net, due to the cooling and windproof effect, the communication speed between the air in the covered area and the outside world is reduced, and the relative humidity of the air is significantly improved. At noon, the increase in humidity is the largest, generally increasing by 13-17%, and the humidity is high. , soil evaporation decreased and soil moisture increased.
The sunshade net is made of polyethylene, high-density polyethylene, PE, PB, PVC, recycled material, new material, polyethylene propylene, etc. as raw materials. After UV stabilizer and anti-oxidation treatment, it has strong tensile strength, aging resistance, Corrosion, radiation resistance, lightweight, and other characteristics. It is mainly used for the protective cultivation of crops such as vegetables, incense, flowers, edible fungi, seedlings, medicinal materials, ginseng, Ganoderma lucidum, etc.