2020 Issue №3

The article presents the results of the photosynthetic pigments content ana­lysis (chlorophyll a, b and carotenoids) in the leaves of one of the most com­mon representatives of the urban herbaceous plants — reed fescue Festu­ca arun­dinacea Schreb., in controlled experimental conditions. The content of pigments in the leaves in one day after treatment with organic compounds sharply decreases compared to three days occurred after treatment with pen­tane, hexane, benzene, as well as mixtures of pentane and hexane; pentane and hexane with benz(a)pyrene. The influence of o-xylol, benz(a)pyrene, butyl ate­tate; mix­tures of butyl acetate with o-xylol and benzene with o-xylol caused a more in­tense reduction in the content of pigments three days after the treat­ment of plants. At the same time, the maximum change in the content of pig­ments dur­ing the experiment is caused by the action of butyl acetate, o-xylol and a mixture of butyl acetate with o-xylol; and the greatest decrease in the con­tent of pigments compared to the control was observed under the action of o-xylol.

The work aims to study processing fat-based sludge generated as a waste from the food enterprise in the Kaliningrad region through vermicomposting to obtain environmentally friendly bio-fertilizer. The research focused on chemical composition and physicochemical properties of fat-containing sludge and soil samples before and after the process of vermicomposting. The bioferti­lizer has been studied to conform to the basic regulatory indicators, and the main indicators: pH, organic matter and total phosphorus were assessed to meet the requirements for biofertilizers. The authors conclude that the use of the organic fertilizer obtained is permissible for the agricultural industry.