Efeito do herbicida glifosato sobre a ação de rizobactérias na cultura da soja

Abstract

This study aimed to study the effect of the glyphosate herbicide on the inoculation of Pseudomonas fluorescens and Bradyrhizobium japonicum, in order to determine the residual effect of this product on the activity of these rhizobacteria in the soybean crop. The experiment was implemented in 04/2017 at the Federal University of the Southern Frontier (UFFS), Laranjeiras do Sul-PR, in a controlled environment, using as a substrate a RED LYROSOLO Dystroferric. The experimental design was completely randomized blocks (DBC), with 9 treatments and 6 replicates, totalizing 54 experimental units conducted in polyethylene pots with a capacity of 10 liters. In this way, the treatments tested were: T1- NPK - without inoculation of rhizobacteria and without application of glyphosate herbicide, and with fertilization of nitrogen (N), phosphorus (P) and potassium (K); T2- Fertilization of nitrogen (N), phosphorus (P) and potassium (K); adding the inoculation of Pseudomonas fluorescens; T3- Fertilization of nitrogen (N) and potassium (K); adding the inoculation of Pseudomonas fluorescens; T4- Fertilization of nitrogen (N), phosphorus (P) and potassium (K); adding the inoculation of Pseudomonas fluorescens with the application of glyphosate; T5- Fertilization of nitrogen (N) and potassium (K); adding the inoculation of Pseudomonas fluorescens with the application of glyphosate; T6- Phosphorus (P) and potassium (K) fertilization; adding the inoculation of Pseudomonas fluorescens and Bradyrhizobium japonicum; T7- Potassium fertilization (K); adding the inoculation of Pseudomonas fluorescens and Bradyrhizobium japonicum; T8- Phosphorus (P) and potassium (K) fertilization; adding the inoculation of Pseudomonas fluorescens and Bradyrhizobium japonicum with the application of glyphosate; T9- Potassium fertilization (K); adding the inoculation of Pseudomonas fluorescens and Bradyrhizobium japonicum with the application of glyphosate. The results show that the herbicide did not interfere with the action of the rhizobacteria. These rhizobacteria showed synergism, to Pseudomonas fluorescens a non-labile phosphorus solubilization to labile in the soil.