Efect of inoculation of potato tubers with Bacillus bacteria on the population of rhizosphere mic roorganisms

Abstract

Estimation of the effectiveness and potential mechanism of action of biological agents on various soil profiles and crops allows more accurate recommendations for their application, and ultimately leads to an increase in crop yields. In the article is researched the composition and structure of the soil microbial community during pre-planting inoculation of potato tubers of the Tuleevsky variety with strains of the g. Bacillus: B. thuringiensis ssp. morrisoni; B. thuringiensis sp. dacota; B. subtilis; B. liheniformis during 2019-2020 in the Novosibirsk region, Novosibirsk, Educational and Production Facility «Sad Michurintsev» of the Novosibirsk State Agrarian University. The most effective strain was B. thuringiensis vs. dacota, which has a multilateral positive effect on soil microflora. The strongest effect on ammonifying bacteria was shown by B. thuringiensis vs. morrisoni. All bacterial strains inhibited the development of Fusarium and Penicillium fungi. Bacteria those assimilate the mineral nitrogen developed most actively during application of B. thuringiensis vs. dacota in 2019, and B. thuringiensis vs. morrisoni in 2020. Most of the strains had a positive effect on the group of cellulose-destroying and nitrogen-fixing bacteria, but B. thuringiensis vs. dacota showed the highest stimulation of bacterial growth, while B. subtilis oppressed this group. Bacillus liheniformis strain showed antagonistic features against phytopatogens, which also represents a great potential interest for its use in crop production.