Abstract: The present invention relates to a method of controlling the growth of weeds at a cereal crop locus which comprises applying to the locus (a) bromoxynil, which is 3,5-dibromo-4-hydroxybenzonitrile, or ioxynil, which is 4-hydroxy-3,5-diiodobenzonitrile, an agriculturally acceptable salt or ester thereof or a mixture thereof and (b) diflufenican which is N-(2,4-difluorophenyl)-2-(3-trifluoromethylphenoxy)nicotinamide.

Abstract: A method of joining two sheets of a laminated thermoplastic material in a joint wherein the edge portion of a first sheet is butted against a face of a second sheet in which an edge portion of the first sheet, which consists of a central layer of porous plastic material such as a foamed polystyrene and compact facing layers of a thermoplastic material such as polystyrene or polythene, is heated by hot air which first causes the edge portion of the central layer to soften and retract followed by softening of the edge portions of the facing layers which then turn inwardly and join together thus closing off the central layer. The edge portion is then butted against and joined to a heated-up compact thermoplastic layer of the second sheet.