Application of Non-woven Fabrics in Vegetable Production in Greenhouse

According to the reporter's investigation, in recent years, as a new type of covering and heat preservation material, non-woven fabrics have been increasingly used in the production of shed vegetables. In the past, this newspaper has reported sporadically typical examples of Shouguang vegetable farmers' innovative application of non-woven fabrics. In order to allow vegetable farmers to fully understand the physical properties of non-woven fabrics, learn and understand its various applications in greenhouse vegetable production, recently, the reporter consulted some relevant materials, combined with actual vegetable production, and summarized the following. Non-woven fabrics, also known as spunbond non-woven fabrics, non-woven fabrics, are chemical fiber fabrics directly processed by hot melt bonding. The raw materials are mostly polyester filament or polypropylene. According to the physical properties of non-woven fabrics, the following performance can be summarized: 1. Thermal insulation. Non-woven fabric has high transmittance for short-wave light, but lower transmittance for long-wave light than plastic film. Since the heat dissipation in the radiation area at night mainly relies on long-wave radiation, the temperature of the covered area is relatively slow, and the heat preservation effect is outstanding. 2. Breathable and humidified. The eco-friendly bag non-woven fabric is made of filaments stacked on each other into a net shape, has a high porosity, is breathable, permeable, and automatically adjusts humidity. 3. Shading to cool down. Covered with colored non-woven fabric, it has the effect of shading and cooling. Non-woven fabrics of different colors have different shading and cooling effects. The shading effect is black better than yellow, and yellow is better than blue. 4. Anti-aging. The agricultural non-woven fabric has undergone anti-aging treatment. The anti-aging degree is related to its thickness and use time. The thicker the fabric, the lower the strength loss rate. Through investigations and interviews by reporters, combined with the actual application experience of vegetable farmers, it is concluded that the main applications of non-woven fabrics on shed vegetables are: First, it is used at the bottom of the grass thatch as a'secondary' insulation material. The second is to be used as a'slope protection' rainproof material on the back wall of the greenhouse. The whole back wall is wrapped with multiple pieces of non-woven fabric stitched together, and four to five steel wires are pulled to fix it. This way, one can reduce the heat loss of the back wall; the third is to protect the wall from rain and snow. The fourth is to cover and weed to reduce the damage caused by pests and diseases entering the shed. It can be said to serve multiple purposes.