EFFECT OF SOME ECOLOGICAL FACTORS ON MICROBE COMPOSITION OF RHIZOSPHERE AND RHIZOPLANE BY THE EXAMPLE OF OAT SOWING (AVENA SATIVA)

Abstract

The paper presents results of the study on the effect of some environmental factors on microbial complexes of the root zone throughout the growing season for plants by the example of oat (Avena sativa). The rhizosphere and rhizoplane are an area of intense microbial activity, controlled by root exudates and environmental conditions of plant growth. Cellulose-decomposing microorganisms, actinomycetes and fungi, which are present in large quantities in the rhizosphere, weakly breed in the rhizoplane. The number of saprophytic bacteria in the rhizoplane is significantly greater than that in the rhizosphere. In the rhizosphere and rizoplane, at different stages of plant development gram-negative saprophytic bacteria p. Pseudotopas dominate. The greatest number of bacteria as in the rhizosphere and in the rhizoplane is found during the flowering of the plants. The smallest amount corresponds to the stage of maturation. The direct impact on the soil leads to changes in the microbial cenoses of the rhizosphere and rhizoplane as a whole. By maintaining the humidity level at an optimum level (60%) and by loosening soil regularly one may compensate for the negative impact of oil-contaminated soil on microbial cenosis of the root surface of plants.