Resumo

VALERY, Alexis  e  REYES, Isbelia. Evaluation of growth promoting rhizobacteria under different fertilization schemes in maize variety HIMECA-95. Rev. colomb. biotecnol [online]. 2013, vol.15, n.2, pp.81-88. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v15n2.32294.

Bacteria previously isolated, characterized as diazotrophic and inorganic phosphate solubilizers were evaluated under field conditions as plant growth promoters on the maize production when soil fertility was changed. The strains MF1b and MF5, alone and in consortium, were inoculated on maize seeds (HIMECA-95), and these were sown under the following chemical fertility conditions: K, NK, PN, RK, NPK, and NRK (R: phosphate rock). Total dry weight, and N and P contents of the grain were determined at the end of the experiment; also, the % of relative agronomic efficiency (RAE) was calculated. Results showed that inoculation with the strain MF5 alone and in consortium, with the addition of NK fertilizer increased the % RAE in 130 and 403 for the dry weight, in 463 and 116 for the N content, and in 152 and 376 for the P content, respectively, allowing an increase in both production and grain quality. Moreover, it was observed variations among the evaluated parameters which could be related to the low N and P status of the soil, the soil fertility changes after the addition of the highly soluble chemical fertilizers, and the interaction between autochthonous microbial communities and the introduced bacteria. It is concluded that the affectivity of a potential microbial biofertilizer for agriculture should be carefully evaluated under different fertility conditions of soils.

Palavras-chave : PGPR; soil fertility; diazotrophic; bacteria consortium; yield.

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