Impact of Agricultural Management on Quality of Soil, Carbon Storage and Carbon Stratification

Abstract The aim of this study was to characterize the carbon storage – Ec (Mg ha-1), carbon stratification ratio, carbon management index (CMI) in various systems use and management: a) Native forest (NF), b) improved pasture of Tanzania grass (TIP), c) degraded pasture of Tanzania grass (DP), d) hay area (H)  with Urochloa (syn. Brachiaria sp) and e) Corn crop conventionally cultivated for 10 years (CTC). The experiment was conducted at Institute of Animal Science, at Sertaozinho, São Paulo State, Brazil. The experimental design was randomized blocks with six replicates. The Ec, in Mg ha-1, adjusted variations in soil density, related to changes in land use were for native forest (112.9), improved pasture (81.6), system of conventional maize (78.2), field of hay (75.1) and degraded pasture (66.5). The highest values of carbon stratification (SR) were the forest (1.98), and lower in degraded pasture and conventional maize (1.10) – are considered poor in quality, while the improved pasture (1.28) and the area of hay (1.23 ) of media quality and while the forest considered great quality. For the different systems of use and management, low CMI values indicate a loss of soil quality related to native forest (100%), the values obtained in improved pasture (58%) indicate that there is potential for advances in the soil quality, adjusting grazing management and fertilization of annual replacement.

Keywords Carbon management index, Carbon stratification ratio, Organic carbon.

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