... is a polyethylene (HDPE) material by adding UV stabilizers, anti-oxidants, the pipeline from the production of lightweight, high-strength, anti- ... of adverse climate conditions, is a realization of security or high-yield, high-quality agricultural cultivation techniques. In vegetables, flowers, edible ... fields has rapidly expanded and made obvious economic benefits,Shade rate:45%,55%,65%,75%,85%,99%