TY JOUR TI HUMUS SOIL CONDITION IN THE VICINITY OF BIOLOGICAL STATION OFURALFEDERALUNIVERSITY KW brown soils KW sod-podzolic soils KW humus KW group composition of humus KW regression analysis JO Bulletin of KSAU AU Khlystov, I.A. AU Senkova, L.A. PY 2016 IS PB Krasnoyarsk State Agrarian University