Plastic shade net is also called shade net, shade net, shade net, cold yarn or cool yarn. Its product mainly uses polyolefin resin as raw material, and adds anti-aging agent and various coloring materials. After melting, it is a lightweight, high-strength, anti-aging new mesh agricultural plastic covering material. The shade nets are black, silver gray, white, aqua, blue, yellow, black and silver gray, etc. The most commonly used in production are silver-gray mesh and black mesh.
The silver-gray net has good light transmittance and can prevent aphids and virus diseases. It is suitable for early summer, early autumn, and vegetable coverage that requires high light intensity. The shading and cooling effects of different specifications of shading nets are also different. When stitching narrow webs together, use nylon thread for stitching. Do not use cotton thread or commercially available plastic wrap to prevent it from breaking due to aging during use.
1. Lightweight, simple and cost saving.
2. It can effectively improve crop growth environment and reduce disaster damage. The main function of the shading net is to prevent the hazards of strong light and high temperature, heavy rain, wind, frost and birds and insects, and it can provide good environmental conditions for crop growth and development. In summer, the sunshine intensity is often more than 100,000 Lx, while the suitable light intensity of general leafy vegetables is 20,000 to 30,000 Lx. After covering with a sunshade net in summer, the surface temperature can generally be reduced by 4 to 6 ° C, the ground temperature at 5 cm below the ground can be reduced by 3 to 5 ° C, and the temperature at 30 cm above ground can be reduced by about 1 ° C. If it is covered with floating surface, the ground temperature can be reduced by 6 ～ 10 ℃ at a distance of 5 cm. Covered with a black net, the surface temperature is reduced by 9 to 13 ° C, and the temperature is reduced by 4 to 7 ° C at 5 cm underground. Therefore, after covering with a shading net, the light intensity can be reduced to a suitable range for crop growth, so as to facilitate photosynthesis. At the same time, after covering the shading net, it can also reduce the wind speed and reduce the evaporation of soil moisture while shading and cooling, which is beneficial to moisture retention and drought prevention, and reduces the mechanical damage caused by storms to vegetables, sediment pollution, and the damage caused by soil compaction to vegetables. In addition, it can reduce pests and diseases. If covered with a silver-gray net, you can avoid aphid damage and reduce viral diseases. With closed all-day coverage, you can prevent cabbage white butterflies, diamondback moth, Spodoptera litura, and other pests from spawning on vegetables to reduce pests and achieve crops. Pesticide-free and less pesticide cultivation. Currently, shading nets are mainly used for vegetable cultivation in the summer and autumn seasons to relieve the light of autumn. It is mainly used to cultivate cabbage, cabbage, mustard, celery, lettuce, tomato, cucumber and other seedlings in areas with high temperature and rain or susceptible to virus disease, which can improve seedling emergence. Rate to ensure the whole seedlings and strong seedlings.
3. Protect against cold. It can cover frost, cold and frost instead of straw and leaves in winter, which is conducive to achieving stable and high-quality vegetables in winter.