AGRONOMICAL SIGNIFICANCE OF THE PEDOENZYMICAL TESTS

摘要

Enzymic activity of soils results from accumulatedenzymes and also from those of microorganismswhich proliferate in soil. By definition, accumulatedenzymes, so named pedoenzymes, are consideredas present and active, even in the soil where doesn'texist any microbial proliferation. The sources ofaccumulated enzymes are, first of all, themicroorganism cells, but they result even from theplant and animal refuses. The enzymes areaccumulated in soil as free enzymes (exoenzymesfrom living cells plus endoenzymes released fromthe desintegrated cells) and as enzymes bound tocell constituents (enzymes present in cellfragments as well as in viable but nonproliferatingcells). The free enzymes occur, in majority, inadsorbed state on the soil mineral particles and/oradsorbed on the humus. The quantity of enzymesin soil solution is much smaller.