Non woven fabric, made from polyester or polypropylene as raw materials, is sliced and spun into long filaments through screw extrusion, and directly formed into a mesh diameter through hot tying and bonding. It is a cloth like covering with good breathability, moisture absorption, and transparency, and has functions such as cold prevention, moisturizing, frost prevention, antifreeze, transparency, and air conditioning. It also has the characteristics of light weight, easy use, and corrosion resistance. Thickened non-woven fabric has good insulation effect and can be used for multi-layer covering.
Application of polypropylene spunbond nonwoven fabric in vegetable production
1. Covering the vegetable seedling bed surface can provide insulation, moisture retention, and promote seed germination. It can also be used for fertilization, watering, and spraying on the bed surface. Not only is it easy to use, but the seedlings cultivated are also thick and neat.
2. After planting, covering the trunk surface plays a role in insulation, moisture retention, promoting rooting, and shortening the seedling stage. Covering in early spring can generally increase the temperature of the soil layer by 1 ℃ to 2 ℃, advance maturity by about 7 days, and increase early yield by 30% to 50%.
3. The small arch canopy is used for early maturing, high-yielding, and high-quality cultivation, and can also be used for shading, cooling, and seedling cultivation in summer and autumn. White non-woven fabric with a specification of 20 grams or more per square meter can be used for covering in early spring; Silver gray PP non-woven fabric or black non-woven fabric with a specification of 20 grams or 30 grams per square meter can be selected for summer and autumn seedling cultivation.
4. Cover the large and medium-sized shed with one or two layers of PP non-woven fabric with a specification of 30 grams or 50 grams per square meter as a canopy, keeping a distance of 15 centimeters to 20 centimeters wide between the canopy and the greenhouse film, forming an insulation layer, which is conducive to winter and spring seedling cultivation, cultivation, and autumn delayed cultivation. Generally, it can increase the ground temperature by 3 ℃ to 5 ℃.
5. Covering vegetables for overwintering in the open field with PP non-woven fabric for insulation, the insulation effect is more obvious than in greenhouses. Can be used for celery, lettuce, spinach, shepherd's purse, and bean sprouts to prevent freezing damage, promote growth, improve quality, and promote early market launch. Covering with non-woven fabric with a specification of 30 grams per square meter, which can be opened daily and covered at night, can be launched 10 to 20 days in advance, with a production increase of more than 20%.
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