Legaeva A.N.

The effect of organochlorine pesticides on soil microorganisms

An ecological and microbiological study of the soil cover in the Kurgan region was carried out. The study provided for soil sampling on the territory of the children's camp and the surrounding area. The soil was sampled in spring and autumn from a depth of 0-20 cm . The data obtained in 2015-2017 indicate that the soil cover in the Kurgan region today is still contaminated with organochlorine pesticide. It was found that due to the use of organochlorine pesticide on the territory of the children's camp against the fight against the ixod mite, there was a decrease in the number of nitrifiers. In comparison with the territory behind the camp, where processing was not carried out. The number of microorganisms in the spring period in the control variant in 2015 amounted to 70.0 thousand. CFU/g of soil, in 2016 73.3 thousand CFU/g of soil and in 2017 88.3 thousand CFU/g of soil. And the minimum number according to the options where the territory was processed in 2015 is 4.7 thousand. CFU/g of soil; in 2016, 6.3 thousand CFU/g of soil; in 2017, 6.3 thousand CFU/g of soil. In the soil cover of the studied area, there was a significant decrease in microorganisms under the influence of the organochlorine pesticide dichlorodiphenyltrichloroethane (DDT).

Keywords: ORGANOCHLORINE PESTICIDE, MICROORGANISMS, SAMPLES, RESIDUAL AMOUNT, SOIL, POLLUTION, MAXIMUM PERMISSIBLE CONCENTRATION