TY JOUR TI INFRARED SPECTRA OF ALLUVIAL SOIL HUMIC ACID ABSORPTION IN THE OB-IRTYSH FLOOD PLAIN KW humic acids KW alluvial soils KW Ob-Irtysh flood plain KW infrared spectroscopy JO Bulletin of KSAU AU Sartakov, M.P. AU Chumak, V.A. PY 2013 IS PB Krasnoyarsk State Agrarian University