Abstract

CHAMIZO, A. et al. Alfalfa inoculation with arbuscular mycorrhizal fungi and rhizobacteria in two soil types. Terra Latinoam [online]. 2009, vol.27, n.3, pp.197-205. ISSN 2395-8030.

The effect of the arbuscular mycorrhizal fungal consortium Glomus spp. Zacatecas 19 (Zac19), six rhizobacteria strains (Pseudomonas aeruginosa 11PS; Burkholderia cepacia P13; Hafnia alvei isolates S1AS, P25 and P27, and Enterobacter cloacae S3DER), and two soil types (silt and sandy soil) on alfalfa (Medicago sativa L. var. Valenciana) was studied by using a complete randomized 2 x 2 x 7 factorial design with six replicates per treatment. Inoculation of Glomus Zac19 significantly enhanced growth and nutritional status (NPK) of alfalfa, particularly in silt soil. A synergistic effect was observed between Zac19 and the rhizobacteria H. alvei P25 and P27, P. aeruginosa 11PS, and E. cloacae S3DER. Bacteria showed effect variations when they were inoculated alone or in combination with Zac19. Nitrogen content was synergistically enhanced due to the inoculation of Zac19 with P. aeruginosa 11PS and H. alvei P25, whereas P and K content was improved by the dual inoculation of Zac19 with P. aeruginosa 11PS, H. alvei P25 and P27, or B. cepacia P13. Soil type was a significant factor in the behavior and in the expression of beneficial effects to the plant through the inoculation of the rhizobacteria and the arbuscular mycorrhizal consortium Zac19. The rhizobacteria P. aeruginosa 11PS, H. alvei S1AS, P25, and P27 have potential utilization as growth promoting agents of alfalfa.

Keywords : Pseudomonas aeruginosa; Hafnia alvei; Glomus; plant growth promoting rhizobacteria (PGPR).

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