Fontes de nitrogênio associadas a Azospirillum brasilense: impacto sobre crescimento e produtividade de trigo e milho

Abstract

Nitrogen fertilization in wheat and corn crops has the greatest impact on production costs in the fertilization item, due to their importance and need for these cultures. In this way, poultry litter and nitrogen-fixing bacteria can be alternative management strategies to supply nitrogen demand, however, the use of these strategies in isolation or associated with mineral fertilization is still little studied. Therefore, the objective of this work was to evaluate the impact of the bacterium A. brasilense associated with the brood of birds and mineral fertilization in some vegetal parameters and in the final productivity of grains of wheat and corn. The experimental design used was randomized blocks, with 8 treatments and 8 repetitions, they being like this constituted: T1 - Control, T2 - A. brasilense, T3 - 100% N-mineral, T4 - 100% N -mineral + A. brasilense, T5 - 50% N-mineral + 50% N-organic, T6 - 50% N-mineral + 50% N-organic + A. brasilense, T7 - 100% N-organic, T8 - 100 % N-organic + A. brasilense. For plant parameters and final productivity of corn and wheat grains, the data obtained demonstrate that the use of the bacterium A. brasilense was not efficient. Regarding nitrogen sources, when used urea or poultry litter+urea higher productivity is observed when compared to other treatments. Contrary to what was observed when using only poultry litter, the association of this residue with urea can be an alternative to the addition of nitrogen in these cultures.