Qualidade do solo em função dos diferentes sistemas de manejo na região campos das vertentes, bacia Alto do Rio Grande-MG

Abstract

The soil is an alive. dynamic. hody, which. plays key-fiinctinns on terxestrial ecosyetems through its attributes. In this way, this study aimed to evaluate the soil quality through physical, biochemical andchemical attributes indicators ofalterations imposed by diíferent management systems in relation to the native cerrado at Campos das Vertentes region^AltaRiaGrande.-MGWatejshed.EoLthalsamples.weie colledctedal 0-L0^ 10-20 and 20-30 cm deptfs from a typic Acric Red-Yellow Latosol (Oxisol). The evaluated attributes were; total oigamc carbon(QCX water-dispersible. clay- (WDC), flocculation- index (FI), aggregates stability (AS), bulkdensity (BD), porosity, saturated hydrauüc condutivity (HC), soiL resistance to penetration (RPX- carbon. microbial biomass (CMB), mkxobial quotient (CMB/OC), metabolic quotient (qC02), and strock (stC) and carbon balance. The following management systems were- stucüech conventionaL tillage with. potato(CTP); conventional tillage with potato, foUowed by oatand in rotation with corn (CTPOC); conventional tillage wiílLconL (CTCk no-tillage with. com. (NTCk cultivatictn with eucalyptus (GEk and native cerrado (NC). The conservative systems NTC and CE, as a fiinction ofthe smallest soil mcAdme^presentedtíie-smaUestalteratcí^ ia relation-tateie NC syatem. Interms ofbiochemical attributes, the greatest alterations were observed in the CTP, CTPQC and NTC, which^ as a fimctirmnf the. greatest depositions- and law vahjes of metaboUc quotient present the highest stC. The greatest losses in the carbon balance were observed in the CTP, CTPOCandCTC systems.