Microbial biomass in soil fertilized with vinasse and cultivated with maize safrinha in succession to legumes

Abstract

This study aimed to evaluate the effect of different legume species associated with vinasse on soil microbial biomass, activity and their derived indices. The study was conducted in the experimental field of the State University of Mato Grosso do Sul, Municipality of Glória de Dourados, MS, a soil classified as typic, sandy texture. The experiment was conducted in a randomized block, split plot design with four replications. The main plots consisted of four species of legumes used as cover crops: jackbean (FP), madras hemp (CJ), pigeonpea (G) and velvet bean (MP), plus a fallow area (P). Subplots, we evaluated the application of vinasse (presence or absence), an equivalent of 100 m3 ha^-1 amount. Was included in the assessment area with native vegetation (VN) fragment as reference the natural condition of the soil. Carbon values ​​of soil microbial biomass (C - BMS) and soil organic matter (SOM) were higher in VN. Between systems with cover crops, the best results of C-BMS were observed in the systems with MP and CJ. The species of plants used as green manures influenced the soil microbial biomass, being dependent on the behavior of evaluation period. At 90 DAS and green manures, the vinasse causes higher basal respiration and specific soil microbial biomass, and these effects disappear over time.