Minkina Tatyana M. RussiaRostov-on-DonSouthern Federal University, 194/1 Stachki Prospekt, Rostov-on-Don 344090, Russiatminkina@mail.ru Author's articles BIOLOGICAL ACTIVITY OF MOUNTAIN AND PLAIN CHERNOSEM SOILS IN THE CENTRAL CAUCASUS (WITHIN KABARDINO-BALKARIA)