Management systems and parameters of soil organic matter of the savannah of Bahia, Brazil

Abstract

The objective of this work was to evaluate a Red-Yellow Latosol of a sandy-loam texture in the West of Bahia, Brazil, cultivated with soybean (S) under conventional tillage (CT) and no-tillage system (NTS) using Total Organic Carbon (TOC), Soil Microbial Biomass Carbon (SMB-C), Soil Basal Respiration (SBR), Microbial quotient (Micq), Metabolic quotient (qCO₂), Bulk density (Bd) and Carbon Stocks (C_St).The experimental design was a randomized block with four replications: T1 treatments: Soybean (S) under Conventional tillage (S_CT) and T2: Soybean under No-Tillage System (S _NTS), having as reference, a Native Savannah (NS), of phytophysiognomy 'Dirty Field' adjacent to the experimental area. Soil samples were collected in the layers 0.00 to 0.05; 0.05 to 0.10 and 0.10 to 0.20 m. The data were submitted to ANOVA and the means were compared by the Duncan test at the significance level of p ≤ 0.05. The results show that the NTS, in relation to the CT, promotes the values ​​of TOC, SMB-C, Micq and reduces the values ​​of qCO₂ in the layers of the evaluated soil. In addition, the NTS promoted the values ​​of the C_St, contrasting with the values ​​observed in the soil under CT. It is concluded that SPD improves soil quality compared to CT. The NTS promotes bioindicators of soil quality, especially carbon stocks.