Abstract

CASTRO, S.; CERIONI, G.; GIAYETTO, O.  and  FABRA, A.. Relative contribution of biological fixed nitrogen and soil nitrogen to the nutrition economy of peanut (Arachis hypogaea L.) under different conditions of soil fertility. Agriscientia [online]. 2006, vol.23, n.2, pp.55-66. ISSN 1668-298X.

The peanut production in Argentina is concentrated in the central region of Córdoba province. At present, losses of soil fertility and a random decline peanut yield have been reported for this area. The relative contribution of biological nitrogen fixation (FBN) in peanut plants cropped in soils with different fertility, has not been extensively studied. An experiment was carried out to determine the effects of rhizobia strains (TTOO2R, SEMIA 6144R and TAL 1000R) on peanut crop yield and plant nitrogen balance under different conditions of soil nitrogen. The results did not show significant differences in the symbiotic parameters and peanut crop yield between native and non-native strains. However, a relative higher contribution of biological nitrogen fixation was observed in low nitrogen (~58% contribution) than in high nitrogen soil content (~27% contribution). The relative contribution of FBN associated with soil fertility has not been investigated in the central region of Córdoba and it becomes particularly important in crop management for the current Southern cropping region where soils have lower fertility levels. The peanut crop showed a confectionary higher yield, although no significant, during the three years of experiments.

Keywords : Peanut; Biological nitrogen fixation; Soil nitrogen; Nodule occupancy.

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