Resumen

BECQUER, C. J et al. Effect of the inoculation with Bradyrhizobium sp. and nitrogen fertilization on two grain sorghum (Sorghum bicolor L. Moench) varieties. Pastos y Forrajes [online]. 2012, vol.35, n.1, pp.67-78. ISSN 0864-0394.

A field trial was conducted in order to determine the response of two sorghum varieties (CIAP-2E and Sorgo Cebada) to chemical fertilization and biological fertilization with rhizobia, as well as the interaction of the studied factors. An isolated strain of Centrosema plumieri, belonging to Bradyrhizobium sp., was used. The experimental design was divided plots, with three treatments (inoculated, fertilized and absolute control), two sub-treatments (Var. CIAP-2E and Sorgo Cebada) and four replications. The fertilized treatment consisted in an application of 150 kg N/ha (urea) 20 days after planting. The factor fertilization type was not observed to influence by itself the experimental results; it rather interacted with the factor variety. Inoculated Sorgo Cebada had a yield of 4,09 t/ha and did not differ from fertilized Sorgo Cebada (3,52 t/ha) and fertilized CIAP-2E (3,12 t/ha). The variety CIAP-2E, independently from the fertilization type, turned out to be agronomically promising, for its results in the weight of 1 000 grains (27,3 g). Inoculating with the HG2 strain the crops Sorgo Cebada and CIAP-2E is recommended, under similar conditions as the ones in the trial, and conduct further physiological studies on the response of different sorghum genotypes to bacterial inoculation.

Palabras clave : Bradyrhizobium sp.; Sorghum bicolor.

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