The growth-stimulating bacteria (PGPB-group) in the increasing of the plant-microbial interaction potential in the winter wheat agrocenosis

The growth-stimulating bacteria (PGPB-group) in the increasing of the plant-microbial interaction potential in the winter wheat agrocenosis

 

Boroday V.V.^{1, 2},

Doctor of Agriculture Science,

Yakovenko D.O.¹,

¹ Institute of Agroecology and Environmental Management, Metrologichna str., 12, Kyiv, 03143, Ukraine

²National University of Life and Environmental Sciences of Ukraine, Heroiv

Oborony str.15, building 3, of. 207, Kyiv, 03041, Ukraine

 

The use of microorganisms of the PGPB group will contribute to the activation of nitrogen fixation and phosphate mobilization in the soil, and increase the potential of plant-microbial interaction. The purpose of our research was to find out the effect of biological preparations Groundfix® and Azotofit-r® (“BTU-Center”) on the main physiological groups of soil microorganisms during the cultivation of wheat plants of the Bohdana variety in the conditions of the Western Forest-Steppe of Ukraine. The biological preparation Groundfix® includes Bacillus subtilis, B. megaterium var. phosphaticum, Azotobacter chroococcum, Enterobacter spp., Paenibacillus polymyxa. Azotofit-r® contains nitrogen-fixing bacteria A. chroococcum and its biologically active products.

It is established that in the agrocenosis of winter wheat, biological preparations Groundfix® and Azotofit-r® affect the ratio of ecological and trophic groups of microorganisms, in particular nitrogen-fixing, oligotrophic and microorganisms involved in the mineralization of humic substances, and the direction of mobilization processes in the soil. The complex application of biological preparations in different phases of plant development contributed to the slowing down of mineralization processes, the preservation of soil nitrogen in a more accessible form to plants during the period of active growth.

The coefficient of oligotrophicity for the soil with the use of biological preparations in the spring weeding phase was low (<1). This indicates a high supply of soil microbiota with easily digestible organic substances and the formation of optimal conditions for the functioning of the soil microbial complex.

The use of Azotofit and Groundfix (3 l/ha) for pre-sowing cultivation contributed to the abundance of saprotrophic species in these variants within 88.9-90.0% of the total abundance of micromycetes.

Thus, the use of biological preparations Azotofit and Groundfix contributed to reducing the infectious potential of the soil and  increasing its microbiological activity in the agrocenosis of winter wheat.