Resumo

AGUIRRE-MEDINA, Juan F.; CULEBRO-CIFUENTES, Fernando; CADENA-INIGUEZ, Jorge  e  AGUIRRE-CADENA, Juan F.. Tabebuia donnell-smithii Rose growth inoculated with mycorrhizal fungi and Azospirillum brasilense. Agrociencia [online]. 2014, vol.48, n.3, pp.331-345. ISSN 2521-9766.

Unregulated logging in tropical forests promotes invasion of secondary vegetation that compete with species of medium and slow growth, limiting their natural regeneration. Many reforestation efforts fail for this situation endangering the ecosystem balance by differences in density and distribution of species. In order to promote a greater growth in shorter time of the timber species (Tabebuia donnell-smithii Rose) primavera under nursery conditions, the effect of inoculation with Rhizophagus intraradices (Schenck et Sm.) Walker et Schuessler, Glomus spp., and Azospirillum brasilense Tarrand, Krieg et Dóbereiner was evaluated. Nursery was established with seeds collected in the Soconusco, Chiapas, Mexico, in plastic bags of 5 kg with a mixture of Andosolmollic soil and river sand washed (1:1) with 2 g of inoculant at the time of transplantation. Azospirillum brasilense had a concentration of 9X10⁶ bacteria g^-1 and R. intraradices 40 spores g ^-1 of soil with 95 % of colonization to the root system. The experimental design was completely randomized treatments were individual, combined microorganisms, and a control with four replications. Morphological and physiological variables of yield, percentage of mycorrhizal root colonization were recorded every 28 d from the 56 d to 168 d after sowing. Plants with R. intraradices, double symbiosis A. brasilense+R. intraradices and Glomus sp. (V) showed higher increase of biomass at 112 d (p ≤ 0.05), whereas the highest nitrogen content was found in roots of plants inoculated with R. intraradices and in the shoot with A. brasilense. The phosporus content was higher with A. brasilense and R. intraradices on the shoot. The final significant differences in plant height were 6 to 8 cm among inoculated treatments and of 16 cm of these with respect to the control.

Palavras-chave : Azospirillum brasilense; biofertilization; Rhizophagus intraradices; Glomus; nitrogen and phosphorus.

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