THE ROLE OF THE PEA (PISUM-SATIVUM L) CUL TIVAR GENOTYPE AND THE RHIZOBIUM-LEGUMINOSARUM STRAIN IN THE EFFECTIVENESS OF SYMBIOSIS

The symbiotic ability of several pea cultivars and Rhizobium leguminos arum strains was analyzed in vegetation and field experiments. In vege tation experiments, the contribution of macrosymbiont genotypes to the value of the symbiosis effectiveness index was found to be significan tly higher than that of microsymbiont genotypes. The roles of symbioti c partners in determining nitrogen fixation activity of nodules were e qual. In field experiments, the R. leguminosarum strains studied contr olled 23.2% of total variation of the value of a specific content of n itrogen in the grain and only 2% of the variation of grain mass. The p ea cultivars determined 27.9% of the variation of grain mass but did n ot influence the content of nitrogen in the grain.