Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 2
Written by Boyka MALCHEVA, Vera PETROVA, Milena YORDANOVA, Pavlina NASKOVA, Dragomir PLAMENOV
Fertilization with biochar (carbonized wood chips) and compost (well decomposed cow manure) was carried out on the following crops: zucchini (Cucurbita pepo), broccoli (Brassica oleracea), broad bean (Vicia faba) and leeks (Allium ampeloprasum). The introduction of organic fertilizers increases the development of all groups of microorganisms studied most strongly in zucchini, followed by broccoli and less in cultures of broad bean and leek. In zucchini, the application standalone of manure and biochar has a more microbial-stimulating effect, while in broccoli, broad bean and leek, the combined fertilizing variants increase the activity of soil microorganisms to a greater extent. As sampling days increase after application of organic fertilizers the biogenicity decreases, more noticeably after 200 days of application. The highest percentage in the composition of the total microflora is occupied by the ammonifying bacteria (non-spore-forming bacteria and bacilli), and the least represented are micromycetes and actinomycetes.
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