Siver-grey mulch. Autumn Ya, covering for flooding, and weeding antivirus and subsoil of the role. Siver-grey mulch euphotic rate to 15%, reflective rate is higher than 35%, reflective with infrared, a drive to avoid role of aphids. And the main aphids are virus disease, insect has media prevention virus disease role. Its transmission rate and low, have inhibition of weeds. Its coverage generally USES the tile way. Awning vegetables can hang with silver in vents plastic Ya prevention. Plastic film is silver based resin in silver add siver-grey mother aggregates blowing and into, or use spraying process in a layer of foil composite membrane surface, made with silver or silver mulch. Its function besides curtailing outside, main characteristic is subsoil because the glowing silver grey film role, artificial changed aphids living environment, because the aphids like living in the leaves on the back of aphids, a drive to avoid role, membrane thickness 0.012 ~ for 0.030 mm, suitable for tobacco, grapes, green pepper, fruit trees and other crops, can increase crop in the mid-lower photosynthesis, the fruit color help, grape sugar can improve the three percent.