Resumen

VALLEJO, Margarita M; BONILLA C, Carmen R  y  CASTILLA, Luis A. Evaluation of the association nitrogen fixing bacterias interspecific - rice lines - nitrogen, in typic haplustalf. Ibagué, Colombia. Acta Agron. [online]. 2008, vol.57, n.1, pp.43-49. ISSN 0120-2812.

The study was carried out at the Cauchitos farm, Ibague municipality department of Tolima, with bounds: North 4°23'51" and west 75°9'7", 979 ansm, the average temperature is 24,3°C, tropical dry forest (bs-t) in the Holdridge classification. The purpose of this study was to evaluate the association between the nitrogen fixation bacteries with and without inoculo in 10 interespecific rice lines with three nitrogen dosis (0, 50 and 100% de 250 kg/ ha^-1) and three repetitions. The inoculation was realized with 10⁸ former units of colonies per millimeter. 2.260 bacteries of the generums Azotobacter spp y Azospirrillum spp., and identification the species: Azospirillum brasilense, Azospirillum lipoferum, Azospirillum amazonense, were identified and from the genus Azotobacter were identified the species: A. choroococcum, A. vinelandii, A. paspali and A. veijerinckii. Weren't found none significative differences after the inoculation. Azotobacter spp and Azospirillum spp. were typical generums of the bacterian flora in the rice plantation and in field conditions were effect of the treatment effects in the bacterian . The Azotobacter spp was the predominant in generum in each one of the treatments.

Palabras clave : Oryza sativa; O. rufipogon; O. glaberrima; Azotobacter; Azospirillum.

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