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Published:
Apr 16, 1993Keywords:
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Evaluation of Symbiotic Nitrogen Fixation by Rhizobial Strains in Common Bean (Phaseolus Vulgaris L.) Using the 15N Isotope Dilution Method
Abstract
The study was carried out under phytotron conditions to evaluate the symbiotic effectiveness of five strains of Rhizobium leguminosarum by. phaseoli (CIAT 144, CIAT 166, CIAT 652, CIAT 899 and Sweden 458) on two cultivars of common bean (Phaseolus vulgaris L.) using the "N isotope dilution method. Nitrogen as Ca (NO3)2 (5.736 atom% '5N excess) was applied at the rate of 20 mgN/kg soil. The two bean cultivars (Rondina and Stella) differed in their dry matter yield at well as N2 fixing abilities with the different rhizobial treatments. The per cent of plant N derived from the atmosphere (% Ndfa) averaged 47.6% for Rondina and 54.3% for Stella over all rhizobial strains. The actual amount of N2 fixed varied between 40 mg/pot and 89 mg/pot depending on the bean cultivar and rhizobial strain. Rondina averaged 53 mg fixed N/pot and Stella 74 mg fixed N/pot.
