The effect of <i>Bacillus thuringiensis</i> subsp. <i>aizawai</i> on the composition of soil microbiota and potato yield

Abstract

The bacteria Bacillus thuringiensis subsp. aizawai (B. thuringiensis subsp. aizawai) are entomopathogenic microorganisms that are used to control the abundance of insect pests, in particular members of the Lepidoptera and Diptera orders. The growth-stimulating effect of the bacterium B. thuringiensis subsp. aizawai on potatoes. In particular, an increase in plant biomass by 1.4 times was noted already on the 4th week of accounting compared with the control. The length of the roots and the number of stolons were statistically higher by 1.2 times and 2.3 times on the 10th week of counting when processing a suspension of B. thuringiensis subsp. aizawai compared to controls, respectively. Preplant treatment of B. thuringiensis subsp. aizawai had a positive effect on the rhizosphere microflora. It has been established that B. thuringiensis subsp. aizawai leads to an increase in the number of ammonifying bacteria by 8 times, nitrogen-fixing bacteria by almost 30 times, cellulolytic bacteria by 1.3 times relative to the control and suppresses the number of micromycetes by 21% and 27% compared to the control and standard, respectively. Increasing groups of nitrogen-fixing bacteria using B. thuringiensis subsp. aizawai contributed to an increase in potato yield by 13% and 24% compared to the control and standard. Influence on the ratio of the potato fraction under the influence of B. thuringiensis subsp. aizawai has not been rendered.