The present invention refers to a plastic film for agricultural use and especially for row cultivation covering like soil coverage or coverage under low tunnels. The plastic film of any length L and width B bears on both sides throughout its length L, two different types of weight insertion vaults: slow-filling (or trapping) vaults (5.1) and fast-filling (or expansion) vaults (5.2), repeated and alternating along the whole length of the film. During the use of plastic film the expansion vaults are immediately filled by the user with water or other liquid substances while trapping vaults are filled slowly with the water that will drench the plastic film and due to gravity and the film's inclination will enter them. So the plastic film is retained securely on the coverage row.
