Crecimiento de Zea mays inoculado con Bacillus cereus y Micromonospora echinospora con fertilizante nitrogenado al 50

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. Resumen El cultivo de Zea mays (maíz) demanda fertilizante nitrogenado (FENI), como NH4NO3 (nitrato de amonio), el cual, aplicado en exceso, provoca la pérdida de productividad del suelo. Una alternativa de solución para este problema es la reducción y optimización de la dosis de FENI, con inoculantes a base de géneros de bacterias promotoras de crecimiento vegetal (BAPOCEVE). El objetivo de este trabajo fue analizar el crecimiento de Z. mays inoculado con Bacillus cereus y Micromonospora echinospora a la dosis 50% del FENI. Bajo un diseño experimental de bloques al azar con el NH4NO3, a la dosis 50% (5 g/L) en Z. mays inoculado con B. cereus y M. echinospora, mediante las variables-respuesta: porcentaje (%) y tiempo de germinación, fenología: altura de planta (AP), número de hojas (NH) y longitud de raíz (LR), la biomasa: peso fresco y seco aéreo y radical: PFA/PFR/PSA/PSR, la plán