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Abstract: Samples from conventional (C) and environmentally-controlled ("cold" and "hot" EC) composts taken at various stages of composting and mushroom (Agaricus bisporus) growth were analysed for changes in 80% ethanol and water extracts, monosacchandes in acid hydrolysates of polysaccharides, lignin concentrations, and lignin structural features Variable amounts of extraneous inorganic solids in the form of fine sandy particles were removed by sedimentation of the samples in a CCl4-CH2-Br2 mixture The relative lignin content of all composts as measured by the acetyl bromide procedure increased, both durmg composting and mushroom growth On the assumption that the absolute amount of hgmn remains unaltered dunng composting and mushroom growth, the relative changes to the polysaccharide concentrations were calculated thus durmg composting 70, 53 and 58% of the initial wall polysaccharides for C, "cold" and "hot" EC composts, respectively, were consumed by compost microorganisms During spawn running and cropping 13, 16 and 15% for C, "cold" and "hot" EC composts, respectively, disappeared Thus considerable amounts (17-31%) of polysacchande remained at the end of mushroom production Dunng composting, there were changes in the degree of condensation and m the extent of oxidation of the hgmns in all cases, but the rate and extent of these changes was dependent on the different composting regimes During mushroom growth, fiirther changes occurred, again with different pattems for the different compost types
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