The role of non-woven fabrics on the vegetables in the greenhouse and the method of use in production

As a new type of covering and thermal insulation material, non-woven fabric is used in the production of shed vegetables and has achieved good economic benefits. 1. Heat preservation: non-woven fabric has lower transmittance to long-wave light than plastic film. Because the heat dissipation in the radiation area at night mainly relies on long-wave radiation, the coverage and heat preservation effect is outstanding. 2. Breathable and moisture-regulating: The non-woven fabric is made of filaments that are laid on each other to form a net, with high porosity, breathable, water-permeable, and automatic humidity control. 3. Shading and cooling: It is covered with colored non-woven fabric, which has the function of shading and cooling. Non-woven fabrics of different colors have different shading and cooling effects. Black is better than yellow, and yellow is better than blue. 4. Anti-aging: The agricultural non-woven fabric has undergone anti-aging treatment, the thicker the fabric, the lower the strength loss rate. After the practice of vegetable farmers, non-woven fabrics are mainly used in the production of shed vegetables in the following aspects: (1) Used on the bottom of the grass thatch as a 'second way' insulation material for many sheds, not only covering the grass thatch , And also added a layer of non-woven fabric at the bottom of the grass thatch. According to vegetable growers, by adding'erdao' thermal insulation material (non-woven fabric), the thermal insulation performance of the shed can be significantly improved, which is 2 ℃-3 ℃ higher than that of the simple covering grass thatch, which is conducive to the growth of vegetables. In addition, the application of non-woven fabrics on the shed using the roller shutter machine can also protect the grass thatch and extend its service life. (2) The rainproof material used on the back wall of the solar greenhouse as a'slope protection' is stitched together with multiple non-woven fabrics to wrap the entire back wall, and fixed with steel wires, which can reduce the heat loss of the back wall; it can prevent rain and snow , Protect the wall; it can be covered and weeded to reduce the damage caused by pests entering the shed. (3) Other applications are used in the production of watermelon in early spring arched sheds covered by multiple membranes. The non-woven fabric can be directly covered on the small arched sheds in the arched sheds, which has outstanding thermal insulation and cold-proof effects.