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Published in Scientific Papers. Series B, Horticulture, Volume LXII
Written by Boyka MALCHEVA, Milena YORDANOVA, Radoslav BORISOV, Teodora VICHEVA, Maya NUSTOROVA

The microbiological dynamics of different starting vegetable and animal waste was investigated. There is a 5 variants scheme of compost bunches (4 spring and 1 autumn) with different starters - two spring composts containing a combination of grape vine canes, fruit twigs and grass swath, in addition to one rabbit manure; starter: last year's compost, two spring composts of mulberry twigs with leaves, and when the compost are turned, a different amount of clean litter and twigs is introduced; starter: soil and one autumn compost containing pepper and tomato stems and leaves, roots of tomatoes and pepper with soil, green leaves of leeks, corn and leek waste. A 6-fold microbiological analysis was started on the 7th day of the compost materials and repeated in 7-10 days during the compost reversal period. Main groups of heterotrophic microflora - ammonifying bacteria (non-spore and bacilli), actinomycetes and micromycetes are defined. The study was carried out by the method of dilution and culture of solid nutrient media with determination of cfy (colony forming units) in 1 g abs. dry substrate. The data from the microbiological analysis show differences in the course of the individual stages of composting by microbiological indicators. These differences are expressed in terms of both the total amount of microorganisms in the substrates and the dominant physiological and systematic groups of microorganisms in the microbiocenosis. The different microbiological composition of the compost materials determines a different rate of decay of the separate raw materials, which is reflected in the duration of the composting process itself.

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