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Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 1
Written by Boyka MALCHEVA, Milena YORDANOVA, Vera PETROVA, Pavlina NASKOVA, Dragomir PLAMENOV

Microbial biomass carbon and enzymes, degradation carbohydrates have been investigated for the composting of various vegetable and animal wastes. A 4-variant scheme for compost piles from plant residues (vine sticks, fruit twigs, leaves, grass slopes) and rabbit fertilizer with different starters (last year's compost and soil) has been prepared. Microbial biomass and enzymes: cellulase, invertase, amylase and catalase have the highest values up to the 7th day of starting the experience. The higher momentary cellulase activity at the beginning of the experiment determines and a higher potential cellulase activity in cultivation of the variants for the first 10 days, as well as a faster rate of cellulose degradation over the entire composting period. Invertase activity values is lower than these of cellulase and amylase activities. The catalase has shown a smaller decrease at the end of the experiment compared to the beginning in comparison with the other enzymes. Microbial carbon biomass and enzyme activities have a main role in the carbohydrates degradation as an integral part of organic matter and are sensitive indicators in the composting process.

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