Objective. Investigate the microbiological processes of transformation of plant residues in corn under introduction of microorganisms — producers of cellulase enzyme complexes in the agrocenoses, which play an important role in the biodegradation of fresh organic matter. Methods. Field, microbiological, biochemical, statistical. Results. In the conditions of long-term field experiment on leached chernozem (short-rotation crop rotation: corn for grain – buckwheat – soybean), the microbiological processes at mineralization of 8 t/ha of leaf-stem weight of corn have been investigated. It was found that during the growing season of buckwheat in the soil (the first year after the introduction of corn residues) and soybeans (the second year after the introduction of residues), the number of cellulolytic microorganisms increases. Their number was the highest in buckwheat agrocenoses in the variant using Microbacterium sp. 6633 and amounted to 17.7 million/g of soil, whilst a value in the control variant was 11.3 million/g of soil. The second year after the application of corn residues, the highest rates of the number of these microorganisms were reported in the variant with Bacillus sp. 6605 — 15.6 million/g of soil with control parameters of 11.1 million/g of soil. Under the action of destruction bacteria of organic matter, the enzymatic activity of the soil increased, namely: cellulase, peroxidase and polyphenol oxidase ones. Cellulase activity when using Pseudomonas sp. 6650 and Microbacterium sp. 6633 increased 1.9 times. An increase in the biochemical coefficient of humus accumulation by Muromtsev under the influence of microorganisms introduced into agrocenoses was reported. Conclusion. Under the action of representatives of the genera Bacillus, Microbacterium, Pseudomonas, the processes of mineralization of corn leaf mass in leached chernozem are activated: the number of cellulolytic microorganisms, cellulase, peroxidase and polyphenol oxidase activity increases. Parameters of the biochemical coefficient of accumulation of humus according to Muromtsev indicate an increase in the intensity of decomposition of fresh organic matter under the introduction of plant residues. These microorganisms are promising for the development of a microbial preparation designed to optimize the processes of mineralization-immobilization using crop by-products.
The effect of zero-tillage technologies on the transformation of organic matter in leached chernozem
