IMPACT OF CROP-ROTATION AND PHENOLOGICAL PERIODS ON RHODANESE ACTIVITY AND FREE SULFURIC AMINO-ACIDS CONCENTRATIONS IN SOILS UNDER CONTINUOUS RYE CROPPING AND CROP-ROTATION

Rhodanese activity as well as the concentrations of free sulfuric amin o acids in soil under continuous rye cropping and crop rotation were s tudied. Experiments were carried out in different phenological periods of plants. In soil under continuous rye cropping, higher concentratio ns of free sulfuric amino acid and higher values of rhodanese activity were found than in soil under crop rotation. Analysis of the correlat ion between the amount of sulfuric amino acid and rhodanese activity s howed that the enzyme was more efficient in soils under crop rotation than in soils under continuous rye cropping.