Indicadores biológicos de um argissolo enriquecido com cálcio em função da qualidade da biomassa aplicada.

Abstract

Many of lhe agricultural sustninabílity issucs arc ossociated with soil qualiiy. Thus, ils asscssment and lhe way it changcs over lime is a significam indicalor of whethcr thc farming systcm is suslainoblc. This sUidy aims to verify lhe changcs in lhe biological indicalors of an ARGISSOL enriched wiih calcium submillcd lo a no-lillage syslcm and the application of biomass of diffcrcnl qualities.The expcrimcnl was conducled in lhe experimental arca of the State Univcrsily of Maranhão. São Luís campus. In this expcrimcnl. the trees were previously cstablishcd in 1996 and in 2020, the number of plols of the experiment was reduced for two, which were divided in relalion lo thc presence or absence of Mombaça grass, lhe design used was a randomized block design, with 4 blocks and 6 treatments, which are: Sombreiro + Leucena (S+L); Acacia + Lcucena (A+L); Leucena + Glyricidia (L+G); Acacia + Glyricidia (A+G); Sombreiro + Gliricidia (S+G) and Control. Thc analyzes of the indicators were conductcd for: soil microbial biomass, basal respiration. organic carbon, dehydrogenase enzymc, water-soluble carbon, organic matter fractions, focusing on the organic carbon associatcd with the mineral and the Chemical atlribute regarding Ca+2. Our results confirm the hypothesis that high-quality biomass enhances lhe mechanisms that drive MOS stabilization. The variation of biological coefficients caused an increase in microbial necromass and led to a higher content of the stable fraction of MOS. These results indicate that lhe use of high-quality biomass is an adequate strategy to increase soil carbon sequestration and reduce the emission of greenhouse gases into the atmosphere.