The aim of this study was to determine the effect of the no-tillage planting systems (NT) under different years of implantation and of conventional tillage, growing soybeans and maize for two crop years, on carbon stocks and physical attributes of a Red Oxisol in comparison to native forest. A completely randomized design with split-plots (five treatments and three layers) was used, with four replications. The treatments in 2008/09 were: NT with 5 (NT5); NT with 7 (NT7); NT with 9 (NT9) years of implantation, conventional tillage (CT) and a native forest area (NF). The treatments extended to the year 2009/10, identified as: NT6, NT8, NT10 and CT and NF; the studied soil layers were: 0-10, 10-20 and 20-30 cm. The results obtained showed that most of the treatments maintained the carbon stock content (CS) during transition from the surface layer to the underground layer. CS was more pronounced in the surface layer and, within it, the NT9 and NT10 were the most relevant in comparison to the other conservationist systems.
soil organic matter; no-tillage; conventional tillage
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