Uso de Azospirillum brasiliense na cultura do milho com diferentes doses de nitrogênio em cobertura

Abstract

Biological nitrogen fixation in maize can reduce the amount of nitrogen applied, thus reducing costs. The objective of this work was to evaluate grain yield and nutrient concentration in leaf tissues by the use of Azospirillum brasilense in corn. The experiment was conducted in the municipality of Centenário - RS, during the agricultural year of 2016/2017. The experimental design was a randomized block design, divided in 2 blocks, each block with 4 treatments and 4 replications, in a total of 32 experimental units with an area of 2.10m x 5m, totaling 10.5m ² each experimental unit. The treatments were as follows: T1 without NPK and without urea, T2 with NPK and without urea, T3 with NPK and with half of the dose of urea and T4 with NPK and full dose of urea. The evaluated variables were: productivity and concentration of nitrogen and phosphorus in plant tissues. The inoculation of Azospirillum brasilense does not influence crop yield. The use of 50% and 100% of the nitrogen recommended for the crop did not statistically differentiate grain yield. The inoculation of Azospirillum brasilense did not increase the levels of nitrogen and phosphorus in the foliar tissues.