PP nonwoven fabric using in vegetable production
Non-woven fabrics are also called non-woven fabrics and harvest fabrics. They are made of polyester or polypropylene as raw materials. The filaments are extruded by a screw and spun filaments and directly formed into a net diameter by heat bonding. It is a kind of good air permeability and moisture absorption. The cloth-like covering with high performance and light transmittance has the functions of cold protection, moisturizing, anti-frost, antifreeze, light transmission, air conditioning, etc., and has the characteristics of light weight, convenient use, and corrosion resistance. The thickened non-woven fabric has the heat preservation effect Well, it can also be used for multi-layer coverage.
Covering the bed surface during the vegetable seedling stage plays the role of heat preservation, moisturizing, and promoting seed germination. It can also be fertilized, watered, and sprayed on the bed surface. Not only is it easy to use, but the seedlings cultivated are thick and neat. Because its heat preservation, air permeability, and moisture control are superior to mulching film, its effect of covering seedlings is better than mulching film. Non-woven fabric specifications include 20 grams, 30 grams, 40 grams, 50 grams and 100 grams per square meter, with a width of 2 meters to 8 meters, and three colors of white, black, and silver gray. The optional specification for bed cover is 20 grams or 30 grams per square meter of non-woven fabric, and the color is white or silver gray in winter and spring. After sowing, spread the non-woven fabric that is longer and wider than the border surface directly on the bed surface. Because the non-woven fabric has a certain degree of flexibility, the length and width must be greater than the length and width of the border. The two ends and sides of the border must be fixed, and the cloth edges should be compacted with soil or stones, or U-shaped or T-shaped curved rods made of iron wire can be fixed at a certain distance. After emergence, according to weather conditions and vegetable production requirements, pay attention to timely uncovering, usually during the day, night or cold weather.
After planting, the cover of the compartment surface plays a role of heat preservation, moisturizing, promoting rooting and shortening the slow seedling period. Such as early spring mulching can generally increase the ground temperature by 1°C to 2°C, advance the maturity by about 7 days, and increase the early yield by 30% to 50%. After planting melons, vegetables and solanaceous vegetables, pour the root water thoroughly and cover it all day long. Cover the plant with a non-woven fabric with a specification of 20 grams or 30 grams per square meter directly, land on all sides, and press soil or stones on the four sides. Pay attention to the non-woven fabric not to be too tight, to leave room, so that vegetables have sufficient space for growth. Adjust the position of the soil or stones in time according to the growth rate of vegetables. After the seedlings survive, the coverage time is determined according to the weather and temperature: when the temperature is high on a sunny day, they should be exposed during the day and covered at night, and cover early and late; when the temperature is low, cover early and cover all the time when the cold wave comes. The non-woven fabric will be removed after mid-to-late April.
The small arch canopy is used for early-maturing, high-yield and high-quality cultivation, and can also be used for shading and cooling seedlings in summer and autumn. White non-woven fabrics can be used for covering in early spring with specifications of more than 20 grams per square meter; for summer and autumn seedlings, silver-gray non-woven fabrics or black non-woven fabrics with specifications of 20 grams or 30 grams per square meter can be used. For example, summer celery has high requirements for shading and cooling, and black non-woven fabrics are used. When early maturity promotes cultivation, cover the small arch frame with non-woven fabric, and then cover with mulching film, which can increase the temperature in the shed by 1.8℃～2.0℃; when covering in summer and autumn, darker colored non-woven fabric can be directly covered on the arch frame. And there is no need to cover with mulch film or agricultural film.
Covering the large and medium shed. Hang one or two layers of non-woven fabrics of 30 grams or 50 grams per square meter as the canopy in the large and medium shed, so that the distance between the canopy and the canopy film is 15 cm to 20 cm wide to form a thermal insulation. The layer is beneficial to the cultivation of seedlings in winter and spring, and cultivation after autumn. Generally, it can increase the ground temperature by 3℃～5℃. Open the sky during the day, cover the sky at night, and close it tightly without leaving a gap. The canopy is closed during the day and opened at night in summer, which can reduce the temperature and facilitate the cultivation of seedlings in summer. Generally, a non-woven fabric with a specification of 40 grams per square meter is used as a canopy. In case of severe cold and freezing weather in winter, the arch canopy is covered with multiple layers of non-woven fabric (specification of 50 to 100 grams per square meter) at night, which can replace straw curtains.
Covering and heat preservation of overwintering vegetables in the open field Cover the open field cultivation with non-woven fabrics, and the heat preservation effect is more obvious than that in the greenhouse. It can be used for celery, lettuce, spinach, shepherd’s purse and bean sprouts, etc., to prevent freezing damage, promote growth, improve quality, and market it early. Covering with a non-woven fabric with a specification of 30 grams per square meter, and uncovering the cover day and night, it can be marketed for 10 to 20 days in advance, with an increase in output of more than 20%.