unwoven fabric
2.The first system consisted of a bucket filled with a substrate of sand/ gravel (20cm of depth), on the bottom of which was a 80 mesh/ inc2 of nylon (S1); the second was similar, but was planted with Lolium perenne Lam (S2); the third was planted with a grass plate consisting of 7 layers unwoven fabric planted with L. perenne (S3).
