USE OF NITROGEN FIXING BACTERIA IN SECOND-SEASON CORN CROP IN NOVA MUTUM - MT

Abstract

Corn requires large amounts of nitrogen, mainly to achieve high productivity, and there are nitrogen-fixing bacteria that can optimize the use of this macronutrient, such as the bacteria Azospirillum brasilese and Methylobacterium symbioticum in monocotyledons, which are capable of capturing nitrogen N₂ and transforming it into NH₃ and NH₄⁺ and making them available to the plants. The objective of the experiment was to evaluate the agronomic characteristics of the cultivation of off-season corn, with the use of nitrogen-fixing bacteria, carrying out biological fixation of the nutrient. The experiment was conducted in the experimental area of ​​the State University of Mato Grosso (UNEMAT), on the Nova Mutum campus, between March and June 2024. The experimental design was a randomized block design (DBC), using two corn hybrids and 4 treatments with 3 replicates for each hybrid, having a total of 24 blocks in the 6 m² experiment, with 24 plants per block, the treatments being Azospirillum brasilese, Utrisha N (Methylobacterium symbioticum), A. brasilense + M. symbioticum and the Control, using the hybrids, P3845 VYHR and P3858 PWU from the company Pioneer. The results showed interaction between the hybrids and the treatments, where the use of M. symbioticum both isolated and associated with A. brasilense obtained positive results for the characteristics: Plant height, Ear insertion height, Stalk diameter.