The microbiological state of open-cast oil-shale pits
1994
Leedu, E. (Estonian Agricultural University, Tartu (Estonia). Department of Soil Science) | Murdam, L. (Estonian Academy of Sciences, Tallinn (Estonia). Institute of Experimental Biology)
Microbiological, enzymatic and agrochemical characteristics were examined: in the profile of humus depot heaps originated from humus horizon material amassed 10 years ago and then transferred and aerated; in backfilled ground; in the recultivated fields exploited up to 12 years. In the profile of humus depot the NH4+ content was high and NO3- low. The number of microorganisms and enzymatic activity decreased with depth. Nitrifying, denitrifying and aerobic cellulose decomposing bacteria and nitratreductase were sensitive to depth, while ammonifying bacteria, azotobacteria, actinomycetes, soil fungi and algae turned out to be rather resistant. The transfer of humus depot resulted in the proliferation of microorganisms and accumulation of nitrates
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