Choosing the right crop cover depends on material, UV resistance, and density. Synthetic materials like polypropylene, polyethylene, and polyester are best for daily use. UV-resistant coatings protect against sunlight damage, and varying fiber densities allow for different amounts of light to pass through. Highly reflective covers and grommets for easy installation are also available.
Choosing the best crop covers depends on the type of material, resistance to ultraviolet (UV) sunlight damage, and density. In fact, some grow covers come in a reflective type for maximum deflection of sunlight from sensitive plants. If you order a specific size of shade, such as for a particular crop field, the manufacturer can add grommet fittings for easier installation and longer life.
Crop covers are subject to heat and cold, especially if they are used on a daily basis. The best cover choice should be a synthetic material, including polypropylene, polyethylene, and polyester. Each of these materials allows rain to permeate through the cloth for adequate watering of plants. Furthermore, the use of these specific fabrics allows the plants to remain cool in summer and warm in winter; crop covers function as effective blankets from the outdoor elements to encourage successful plant growth.
Sunlight is a common culprit in crop damage. In response, you can choose a fabric cover with a UV resistant coating. This coating reflects harmful UV rays while allowing some sunlight to infiltrate the material for warmth and plant growth. The coating not only protects plants from UV rays, but also forms a barrier against weakening of the material. Crop covers without a UV coating can become brittle and crack over time from damage from sunlight.
Quality crop covers have varying degrees of fiber density that allow only certain amounts of light to shine through. Covers can have a dense density where the fibers of the material are tightly woven together for maximum sun protection; these covers typically allow only about 20% of the light to pass through to the plants underneath. The loosely woven fibers will allow more light through the material for sun tolerant plants. Each type of crop requires a different amount of sunlight for best growth; many growers consult grow cover dealers for personalized advice on material density choices.
Although many crop covers are tinted a basic white for sunlight reflectivity, some roofing accessory choices give you the opportunity to select a highly reflective material that looks like aluminum foil. These highly reflective covers are mainly used in very sunny areas prone to heat waves. Another commonly requested accessory are grommets, or protected eyelets. Each cover can be customized in size and the placement of the grommets, especially if the cover is to be secured to a small frame surrounding the plants. Grommets allow for a secure connection to a metal or aluminum frame so the fabric will not tear.
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