Resumen

BECQUER, C. J. et al. Performance of the legume-rhizobium symbiosis in Centrosema plumieri inoculated with Bradyrhizobium sp. Field essay. Pastos y Forrajes [online]. 2012, vol.35, n.2, pp.175-185. ISSN 0864-0394.

A field trial, without irrigation, was conducted at the Sancti Spiritus Experimental Station of Pastures and Forages, Cuba, from November, 2001, to April, 2002. The objective was to evaluate the symbiotic performance of Centrosema plumieri, inoculated with Bradyrhizobium sp. strains, previously isolated from forage legumes of Cuban livestock production ecosystems. The experimental design consisted in randomized blocks; 11 treatments inoculated with native strains, a control inoculated with the reference strain 5030 (Bradyrhizobium sp.) and a non-inoculated control were used, with three replications. A variance analysis (ANOVA), as well as correlation and regression analyses, were applied. The values of the inoculated treatments were statistically equal to those of the absolute control, regarding aerial dry weight (ADW) and N yield (NY), except the one inoculated with the strain HA2 in NY. In general, a weak activity of inoculation was shown. Nevertheless, in the nodulation rate (NR) JH2 and HA2 stood out, with values statistically higher (p<0,05) than the others. The degree of dependence of NY and ADW was weak in the inoculated treatments with regards to NR, although it was strong in NY with regards to ADW. It is concluded that the native strains inoculated in C. plumieri, with the exception of HA2 in NY, as well as JH2 and HA3 in NR, did not exert a highly positive effect on this plant. These results should be evaluated for the continuation of studies related to the legume-rhyzobium symbiosis.

Palabras clave : Bradyrhizobium sp.; Centrosema plumieri; inoculation.

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