It stops weeds from growing, as it does not allow sunlight through.
The reflection from the white layer contributes to high performance and early crop, as it directs extra light to the section of the plant that is above-ground (better reflection than the silver/black mulch film).
It also avoids the risk of burns to the leafy section of the plant and fruit that are in contact with the film, since it heats up much less than black film.
It is a repellent for whiteflies.
By reflecting a large part of the radiation, the ground heats up less and therefore this mulch film is ideal for areas where other types of film (black or natural) would make the temperatures excessive for plant development.