Resumo

GARCIA-RADILLO, Pedro et al. Growth of Zea mays innoculated with Bacillus cereus and Micromonospora echinospora at 50% of nitrogen fertilizer. J. Selva Andina Res. Soc. [online]. 2019, vol.10, n.1, pp.16-24. ISSN 2072-9294.

Abstract In México Zea mays (maize) is a crop which demands nitrogen fertilizer (NIFE) as a NH₄NO₃ (ammonium nitrate), in that sense hiperfertilization causes soil's lost productivity. An altemative of solution to solve this problem is the reduction and the optimization of NIFE with inoculants based on genus and species of plant growth-promoting bacteria (PGPB). The aim of this study was to analyze the growth of Z. mays inoculated with Bacillus cereus and Micromono-spora echinospora at 50% reduced NIFE. An experimental design of randomized blocks was used with (NH₄NO₃) as NIFE at the dose 50% (5 g/L) for Z. mays inoculated with the PGPB: the response variables on its seed: germination percent, day to germination, its shoot and root phenology: height plant, number of leaves, and root long and biomass: aerial fresh weight, root fresh weight, aerial dry weight, root dry weight (AFW/RFW/ADW/RDW). Experimental data were analyzed by ANOVA and minimal significant difference (LSD). Results showed a positive effect of B. cereus and M. echinospora on Z. mays seed as well as at seedling and flowering stages, where Z. mays had a RDW of 3.5 g, numerical valué statistically different compared with 1.1 g of RDW of Z. mays fed with NIFE at 100% dose, not inoculated used as a relative control (RC) Those data suggested that the inoculation of Z. mays with B. cereus and M. echinospora improving radical absorption of NIFE reduce at 50%, due to PGBP were able to transform seed and root organic exudates into growth promoting vegetal compounds (GPVC) or phytohormons avoiding soil's lost productivity.

Palavras-chave : Soil; Z. mays; nitrogen fertilizer; radical absorption; B. cereus; M. echinospora; phytohormons.

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