Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Rozalina KOLEVA, Boyka MALCHEVA, Bilyana GRIGOROVA-PESHEVA
Sanitary-microbiological control of water for irrigation of soils and composts with agricultural crops was carried out. The analyzed water meets the regulatory requirements for indicators of pathogenic microorganisms. The main groups of microorganisms before and after irrigation were studied: non-spore-forming bacteria, bacilli, actinomycetes, micromycetes, bacteria assimilating mineral nitrogen, as well as their mineralization and enzyme activities (catalase, cellulase). The quantity and activity of the studied soil aerobic microorganisms decreased immediately after irrigation, increased up to 12 hours after irrigation, and then decreased again. This tendency is not expressed for the molds. A major share in the composition of the total microflora is occupied by bacteria. Immediately after irrigation, the number of anaerobes increases but remains lower than that of aerobes. The quantity, composition, and activity of the soil microflora depend on the humidity of the soils and soil-compost mixtures, as well as on the microflora introduced with the irrigation water and vary with different agricultural crops. The activity of microorganisms highly depends on their quantity, but it is not an independent factor for their activity.
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