DETERMINATION OF THE TOTAL PHYTOTOXICITY OF SOILS IN GROZNY
The soils of a modern city are characterized by a significant difference in morphological and agrochemical properties, which are clearly visible both in the vertical and horizontal directions. A characteristic feature of Grozny's urbanozems is significant stratification, buried humus horizons of soils under the anthropogenic layer, in which 2550% of inclusions are construction and household waste, fragments of old foundations or bricks. There is a tendency to an increase in the humus content against the background of a large amount of incoming organic matter. The purpose of the study is to study the possibility of using biological resources to determine the state of the urban environment in Grozny. The study was conducted in the period 20162019. Soil samples were taken on the territory of Grozny. The laboratory experience was based on the Parker C method. It was found that herbaceous plants, as part of the biological resource of an urban area, are quite sensitive to environmental pollution, which is determined by different levels of traffic load. This manifests itself in the form of a slowdown in the growth of both the aboveground and underground parts of plants. The most indicative are winter wheat seedlings, whose growth slowed down at two weeks of age by 30.0%. Oat seedlings are the least sensitive to the increased level of environmental pollution. In all the studied plants, the aboveground part was suppressed. More intensive growth of the root system can be considered as the plant's need for nutrients. Statistical analysis showed the presence of an inverse correlation between the level of development of the territory and the germination of seeds of test plants. Thus, it is possible to use the biological resource of annual plants in order to assess the state of the environment in an urban area. In this case, it is most expedient to use winter wheat and watercress as a test plant, in which, under the influence of most pollutants, there is a significant inhibition of the development of the aboveground part.