%0 Journal Article %T INFLUENCE OF SIDERITE CULTURES ON THE HUMUS BALANCE OF OIL-CONTAMINATED CHERNOZEMS OF THE MIDDLE VOLGA REGION %A Trots, N.M. %A Gorshkova, O.V. %K oil production, chernozem, humus, siderites, productivity %J Bulletin Samara State Agricultural Academy %D 2019 %N 4 %P 4 %I Samara State Agrarian University