Abstract: Agricultural soil heating processes, including mulching, green house covering and especially solar soil sterilization are improved using a plastic film or sheet of an aromatic thermoplastic polyurethane.

Abstract: The invention provides a polymeric, multilayer, photoselective film for use in agriculture, comprising at least two layers, an upper layer facing the sky an a lower layer facing the ground, each of the layers being of a different color, and each being light-transmissive, wherein the upper layer is of a color which repels insects, and the lower layer is of a color whereby the solar radiation transmitted by the film and reaching the ground is of such a spectral composition as will largely deprive weeds of essential photosynthetically active radiation, while having a spectral component that will be absorbed by, and will heat, the ground.

Abstract: A load bearing support platform, in particular a platform for use in industrial installations, for the support of electric cables, comprising a plurality of longitudinally extending support bearing elements, preferably formed of reinforced plastics material. A succession of transverse cross-pieces are provided, each cross-piece being formed with a succession of element locating means, preferably through-going ports. Each element is respectively associated with a separate locating means and is supported by the cross-pieces. Element coupling means are provided for coupling adjacent ends of the elements together.