Rhizobium inoculation of Phaseolus vulgaris in Lajas, Puerto Rico

How to Cite

Velázquez, Y. A., Kluson, R. A., & Schroder, E. C. (1988). Rhizobium inoculation of Phaseolus vulgaris in Lajas, Puerto Rico. The Journal of Agriculture of the University of Puerto Rico, 72(3), 427–436. https://doi.org/10.46429/jaupr.v72i3.6871


A field experiment was conducted to evaluate the effect of Rhizobium inoculation methods and the effect of different levels of N fertilization on nodulation, nitrogen fixation and yield of Phaseolus vulgaris L. The N treatment produced a seed yield significantly higher than that of the other treatments. Inoculation treatments had no significant effect on nodule number and dry weight, even when compared to the noninoculated and N controls. This finding was attributed to a high number of Rhizobium phaseoli in the soil. The applications of N and inoculation did not significantly affect the N percentages of foliage and grain or nitrogenase activity. Serological identification of nodules indicated that the native strain UPRM 6000 farmed the largest percentage of nodules (41%), followed by R. phaseoli 127K44 (34%), 127K17 (13%) and 127K12b (10%). The serogroup distributions of inoculated and N fertilized treatments differed significantly from the noninoculated control. Inoculation methods (seed vs. soil) did not differ significantly in either nodulation or yield responses.



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