Influence of compound fertilizer and cupric sulfate on soil enzymes and CO2-evolution
1980
Schinner, F.A. | Niederbacher, R. (Innsbruck Univ. (Austria). Inst. fuer Mikrobiologie) | Neuwinger, I.
1. Compound fertilization inhibits the enzymatic activities of the hydrolytic decomposition of litter. 2. In the nursery soil examined urease and xylanase activities had been distinctly reduced after six weeks, whereas cellulase and invertase activities had scarcely been affected after this period. 3. Through compound fertilization the enzymatic activities of intracellular dehydrogenases increased by the same amount as the microbial biomass. 4. It was proved that, in the case of litter decomposition, extracellular biochemical activity was not at all bound to be in direct relation to the microbial biomass, but that it is closely connected to the decomposible organic matter. 5. An additional treatment of the soil with cupric sulfate brought a toxic effect. Dehydrogenase activity was inhibited by a further 72 per cent, urease and xylanase activities by 30 per cent. Invertase activity was only reduced by 15 per cent and cellulase activity by 10 per cent. 6. The present studies make it possible to understand the complicated interaction between soil microorganisms and the plant, point to the inhibition of litter decomposition by chemical soil treatments (fertilization, addition of a heavy metal) and suggest the competition for nutrients between the plant and the soil microflora. 7. A new method for the determination of invertase activity in soils was developed.
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