TY JOUR TI THE HUMIC ACID ELEMENT COMPOSITION OF CENTRAL URAL SOUTH TAIGA SOILS AND ADJACENT TERRITORIES KW humic acids KW elemental composition KW sod-podzol soils KW brown mountain-forest soils KW southern taiga KW Middle Ural KW Trans-Ural JO Bulletin of KSAU AU Nekrasova, O.A. PY 2013 IS PB Krasnoyarsk State Agrarian University