Investigations on the influence of fertilization and of Onobrychis viciifolia Scop. and Bromus inermis Leiss. Mixture on soil microflora

Abstract

This paper presents the results of an experiment conducted on two temporary meadows, situated in the Southern area of the Moldavian Plain, set up by sowing a mixture made up of Onobrychis viciifolia Scop. (sainfoin) and Bromus inermis Leiss. (smooth bromegrass) at different rates. We have analysed the soil microbiological activity of the two temporary meadows, as influenced by the fertilization with an unconventional product (Vinasse Rompak - 3% N, 0.5% P, 7% K and pH 7-8) and with different rates of organic and chemical fertilizers. The objective of this investigation was to isolate and quantify the microbial population found in soil (Gram-positive bacteria, Gramnegative bacteria, micromycetes and nitrogen-fixing bacteria), thus establishing their percent, main fungus genera, which activate in soil and their activity level for each variant. The results have shown the influence of the fertilization on the total number of microorganisms, on the relationships between the main groups (bacteria and fungi) and on the various micromycete species, determined in each variant of our experiment.