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COMPARATIVE ASSESSMENT OF THE ECOLOGICAL STABILITY OF SOILS TO SANITARY AND BIOLOGICAL CONTAMINATION BY ANIMAL WASTE
Abstract
Violation in technologies of using and storing the organic animal husbandry waste is leading to deterioration in soil sanitary state and agrocoenosis. As a result of increased biological pollution, soil self-cleaning ability is decreasing, which leads to negative changes in its biological diversity and biological activity, arrival of toxic compounds in high concentration, deterioration in vegetable cultivation products quality, state of environment and human health. In this regard, evaluation of the soil sanitary state becomes mandatory in order to establish and forecast its hazard degree to living conditions, public health, as well as to elaborate environmental protection and landscape restoration measures. This article presents results of studying the effect of admitted violations in warehousing, storing and using the animal husbandry waste on the soil sanitary state according to the degree of biological contamination thereof using sanitary and bacteriological indicators, and it reveals the soil genetic and ecological resilience to biochemical contamination and to intensity of the biological load on soils. Anthropogenic impact on soil determines a special agrogenic specific modification of soil with placing the animal husbandry waste on the soil surface due to alteration in the soil biota composition and number, and anthropogenic evolution of arable horizons. Intensity of the Escherichia coli group sanitary indicative organisms is demonstrated, and enterococcus index value in the soil upper layer is established under conditions of violating requirements to warehousing and storage of the animal husbandry waste. Ecological stability and buffering level of soil under study to biological contamination and intensity of the biological load on soil by the number of sanitary indicative organisms was determined.
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