TY JOUR TI THE ASSESSMENT OF HUMUS FALLOW FIELDS PLUCKING DEGREE IN THE KRASNOYARSK KRAICONDITIONS KW soil KW pure fallow KW humus KW mobile humus KW easily decomposed organic substance KW nitrate nitrogen JO Bulletin of KSAU AU Shpedt, A.A. AU Kartavykh, V.V. PY 2012 IS PB Krasnoyarsk State Agrarian University