[Change in the microbiol complexes of soddy podzol soil under the influence of long-term spring wheat monoculture].

The special composition and the properties of microorganisms predominant in the soil and in the rhizosphere of summer wheat were studied in the conditions of monoculture and corp rotation. Noticeable differences were found in the composition of microbial complexes: microorganisms belonging to the genus Arthrobacter prevailed in the conditions of corp rotation, whereas cultures of the genera Pseudomonas and Bacillus predominated in the conditions of monoculture. Many of the latter possessed weak catalase activity and drastically decreased the oxidation-reduction potential of the medium.

[Electron microscopy study of the microorganism topography on plant roots].

The topography of microorganisms in the root cap zone and in the absorption zone was studied with 7-day-old wheat seedlings. No microorganisms were detected in the root cap zone. Individual microorganisms as well as their accumulations were registered in the absorption zone.