Resumo

BLANCO, J.C.; PARAMO, A.Y.  e  MONTILLA, M.A.. Nodules present in leguminous associated to pastures of Brachiaria sp in the Colombian Amazonia. Rev. vet. [online]. 2021, vol.32, n.1, pp.89-94. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.3215642.

19.

Twenty-three Brachiaria sp. pastures were studied, dedicated to dual purpose bovine production to identify species of legumes present and obtain root samples for extraction and nodule counting. The entire area corresponded to a total of 149.14 ha, where only 84.26 ha had the presence of the legumes Desmodium sp, Pueraria phaseoloides, Galactia striata, Arachis pintoi, Estilosantes sp, Mimosa púdica and Centrosema sp, whose coverage was 2.89% of that area. The species with the highest percentage of average coverage was A.pintoi with 5.36% followed by Stylosanthes sp with 5%, G.striata with 3.89% and P.phaseoloides with 2.62%. The rest were found in a range of less than 2% of the pasture area. A mínimum of 7 nodules were found in the roots of Centrosema sp. and G. striata and a máximum number of 194 nodules in Desmodium sp. The amounts greater than 100 nodules per plant only corresponded to Desmodium sp, which reveáis a satisfactory inoculation that is associated with its potential for nitrogen fixation mediated by symbiosis. The species with the lowest number of nodules was M.pudica found in 4.3% of the pastures evaluated, being the only one of the legumes sampled that is not consumed directly by bovines and develops as an unwanted species, indicating degradation levels of pastures.

Palavras-chave : legumes; nodulation; pastures; Brachiaria sp.

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