A reflective ground cover sheet material for agricultural use woven from warp and weft tapes of a plastics film material has an average gap g between edges of adjacent tapes in both the warp and the weft direction in the range about 0.1 mm to about 1.2 mm. The tapes may be of width w in the range 2 to 7 mm. The materials may optimise air, water, solar transmission, long wave radiation or heat and dirt/soil movement through the material, and sufficient coverage and reflectivity, and physical material construction strength.
