THE EFFECT OF DIFFERENT DOSES OF ORGANIC FERTILIZER ON THE MICROBIAL COMPOSITION OF SOUTHERN CHERNOZEM

Abstract

In this paper, the effect of various doses of organic fertilizers from bird droppings on the spread of microorganisms in the rhizosphere of barley is investigated. Microbiological activity of southern chernozems was carried out before sowing barley. The use of organic fertilizers increased the predominance of the number of nitrogen-fixing bacteria absorbing ammonifiers and mineral forms of nitrogen, compared with fungi and actinomycetes. The favorable period for the growth of actinomycetes differentiated in the Gause nutrient medium coincided with the period of full ripeness of barley and a positive effect on their distribution on the variants 5 t/ha and 10 t/ha was noted. Cellulose destroying actinomycetes showed predominant results in relation to fungi, which is an indicator of the intensive destruction of plant residues and organic compounds in the soil. Studies show that increasing the dose of organic fertilizers in experimental variants has an adverse effect on the spread, growth and development of fungi. This may be due to the composition of the biological product used for composting organic fertilizers. The use of bird droppings in high doses promotes the reproduction of nitrogen-fixing bacteria.