How does ground cover film work?

Ground film, or ground covering film, is usually transparent or black PE film, but also green and silver film, used for ground covering to increase soil temperature, retain soil moisture, maintain soil structure, prevent pests from attacking crops and certain microorganisms caused by diseases, etc., to promote the function of plant growth.

The film is mainly used to maintain the soil temperature, depending on the type of crop you grow, the period of use is also different