PLANT GROWTH PROMOTING EFFECT OF INTRODUCED BACILLUS SUBTILIS STRAINS DEPENDING ON THE COMPOSITION OF THE GROWING MEDIA

Abstract

It was detected Bacillus subtilis strains M 9/6, 10/19 and 7MR achieved high survival rates in peat-based substrates and the rhizosphere of plants and the ability to inhibit the development of pathogens. Growth promotion activity detected in B. subtilis M 9/6, biomass of lettuce leaf increased almost 4.5 times compared with the control (without fertilizers). The addition of bentonite or clay in bacterial peat-based growing media increases the productivity of lettuce, respectively, 29.8 and 42.5 % in comparison with the plants grown on such substrate.