IMPACT OF CROP ROTATIONS AND FERTILIZATION SYSTEMS ON HUMUS STATE INDEXES OF SOD-PODZOLIC LOAMY SOILS OF VARIOUS ERODED LEVELS

Abstract

Impact of different crop rotations and fertilization systems on humus state indexes of sod-podzolic loamy soils of various eroded levels has been studied. The best positive effect on stabilization of humus system of eroded varieties was obtained by using fodder-crop rotation with specific weight of grain crops 20 % on the background of organo-mineral fertilizer system. The least effective is grain-crop rotation (60% of grain crops) against the background of the mineral fertilizer system, which is characterized by the strongest decline in the degree of humification (by 2,7-5,3 %), and also as absolute (by 896-1260 mg/kg), and the relative (3,0-5,3 %) content of humic acids in eroded soils relative to the non-eroded analogue.