CARBON SEQUESTRATION FROM A KAOLINITIC OXISOL UNDER FLAXSEED IN CONSERVATIONIST MANAGEMENT

Abstract

Agriculture that employs soil conservation practices promotes ecosystem services such as the mitigation of greenhouse gases. The objective of this work was to evaluate the carbon sequestration from a Latossolo Vermelho Distroférrico (Haplustox) under a conservationist management system for flaxseed production over three years yield. The experiment was carried out for three years in a soil conservationist management system (no-tillage) for the production of three brown flaxseed varieties: Caburé, Aguará and UFSC cultivated in Latossolo Vermelho. Undesturbed and deformed soil samples were collected in two contrasting layers: 0-0.15 and 0.15-0.30 m depth. Soil bulk density, total organic carbon, stocks and CO₂ sequestration -IPCC were determined. Data were submitted to variance analysis and Tukey's test (p<0.05). The soil management used contributed to the soil carbon stock, regardless of the variety used, on average 27 Mg C ha was stored in the 0-0.15m layer and 29.8 Mg C ha^-1 at 0.15- 0.30 m in depth, in addition to mitigating an average of 10.48 Mg CO₂eq ha^-1 in just three years of cultivation, which makes this management system environmentally sustainable with yields equivalent to those obtained in South region of Brazil (0,71 Mg ha^-1).