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ammoniated bark bark for horticulture bark-based Britain British Leather Manufacturers catecol commercial compost conifer bark Corsican pine Corsican pine bark cucumbers Douglas fir bark dry wt effect European larch Experimental Horticulture Station Fixed tannin Forestry Commission fresh bark fuel ground chalk growers growth harmful volatile heat Hide substance horticulture industry inhibit insoluble ised bark Japanese larch leaching Lee Valley Experimental mixed conifer bark moisture content monoterpene content monoterpene level mulch Mushroom culture mycelium nitrogen Norway spruce ornamental plants oven dry weight peat Petri dish Plate Plunge beds potting mixtures production pulverised bark pyrogallol quercetin residues resistance to breakdown Royal Horticultural Society Scots pine Sitka spruce bark soil species of bark spent litter spruces and Douglas Sweet chestnut tannin content temperature terpene thermophilic tion toxic trials undertaken Valley Experimental Horticulture vegetable tannin material volatile oil content water retention Water soluble matter Western hemlock wood processing industries Yield of mushrooms