Application of Non-woven Fabric in Vegetable Production
Harvest cloth is made of polyester or polypropylene as raw materials, and the slices are extruded by screws to spin filaments and are directly formed into a net diameter for hot binding. It is a cloth-like covering with good air permeability, moisture absorption and light transmission. It has the functions of cold prevention, moisture preservation, frost prevention, freezing prevention, light transmission, air conditioning and the like, and has the characteristics of light weight, convenient use, corrosion resistance and the like. Thickened non-woven fabrics can also be used for multi-layer covering due to good heat preservation effect.
Covering the bed surface of vegetables at seedling stage plays the roles of heat preservation, moisture preservation, seed germination promotion and the like, and can also apply fertilizer, water and pesticide on the bed surface. Not only is it convenient to use, but also the cultivated seedlings are thick and neat. Because its heat preservation, air permeability and moisture control are superior to plastic film, its effect of covering seedlings is better than plastic film. The specifications of non-woven fabrics are 20g, 30g, 40g, 50g and 100g per square meter, with a width of 2m-8m and three colors of white, black and silver gray. The non-woven fabric with the specification of 20g or 30g per square meter is selected for covering the bed surface, and the color is white or silver gray in winter and spring. After sowing, non-woven fabrics longer and wider than the bed surface are directly covered on the bed surface. The length and width of the non-woven fabric must be larger than the length and width of the border due to its flexibility. The two ends and sides of the border must be fixed. The cloth edges can be compacted with soil or stones, or U-shaped or T-shaped curved rods made of iron wires can be fixed at a certain distance. After emergence, according to the weather conditions and vegetable production requirements, attention should be paid to timely uncovering, usually during the day, at night or in cold weather.
After planting, the compartment cover plays a role in heat preservation, moisture preservation, rooting promotion and seedling stage shortening. For example, covering in early spring can generally increase the temperature of the ground layer by 1℃~ 2℃, mature about 7 days earlier, and increase the early yield by 30% ~50%. After planting melons and vegetables and solanaceous vegetables, root setting water should be poured thoroughly and covered immediately all day. A non-woven fabric with a specification of 20g or 30g per square meter is directly covered on the plant, all sides of the non-woven fabric fall to the ground, and all sides of the non-woven fabric are pressed by clods or stones. Attention should be paid to non-woven fabrics not to be stretched too tightly, leaving room for vegetables to have sufficient growth space. According to the growth speed of vegetables. After the survival of the seedlings, the covering time is determined according to the weather and temperature: when the temperature is high in sunny days, the cover is uncovered during the day and at night, and the cover is uncovered earlier and later. When the temperature is lower, the early cover will be uncovered later, and the cold wave can be covered all the time when it comes. After mid-to-late April, it will be removed
