MULTI-STRAIN VERSUS SINGLE-STRAIN INOCULATION - EFFECT ON STRAIN EFFECTIVENESS AND COMPETITION FOR SOYBEAN NODULATION

The objective of the study was to investigate the effectiveness of sym biotic associations of soybean variety Kolubara with three different B radyrhizobium japonicum strains (2/1, D-122, 2b), as well as the compe titive ability of the strains in the nodulation process. The experimen t was conducted in the field. Strain 2/1 was the best competitor under field conditions - 64% nodule occupancy. This amount was the highest in the case of the multi-strain inoculations in the field trials.