The effects of tillage systems and crop rotations on soil chemical properties of a Black Chernozemic soil

azote azufre barbecho carbon carbone carbono cero-labranza chernozem chernozems conventional tillage depth fallow fosforo labranza linum usitatissimum minimum tillage nitrate nitrates nitratos nitrogen phosphore phosphorus pisum sativum potasio potassium profondeur profundidad rotation culturale rotational cropping saskatchewan soil morphological features soufre spatial distribution sulfate sulfatos sulfur sulphates sulphur tillage trait morphologique du sol travail du sol travail du sol minimal triticum aestivum zero tillage