Organic and Mineral Source of Nitrogen Associated With Azospirillum brasilense in Culture of Wheat

Abstract

Nitrogen fertilization in wheat is the item that most impacts production costs when it comes to fertilization, due to its importance and demand for this crop. Thus, organic fertilization and nitrogen fixing bacteria can be management strategies to supply the nitrogen demand. The objective of this study was to evaluate the impacts of the bacterium A. brasilense associated with organic fertilization and mineral fertilization on some plant parameters and on the final productivity of wheat grains. The experimental design was a randomized block, with 8 treatments and 8 repetitions, with the following treatments: 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. The parameters of the plant and the final productivity of wheat grains showed that the use of the bacterium A. brasilense was not an efficient strategy, however, in relation to the fertilization sources in the final grain productivity, the use of urea isolated or associated with organic fertilization did not differ from each other and were superior to the other treatments.