When will the plastic film be opened when the vegetables are sprouting?
Plastic films are made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins. The surface tension of the plastic film depends on the free energy of the surface of the plastic film, and the surface energy of the film depends on the molecular structure of the film itself. Plastic film can be used in food packaging, electrical product packaging, daily necessities packaging, clothing packaging, etc..
The seed germination, to uncover the film, if the temperature is low in the evening to cover, but to build a shed, can not let the film fall in sprouts, don't be too much,
One is to take mulch after sowing; two is the plant after the emergence of the seedlings at the top of the window film, let out seedling growth;
