Resumo

RENAN BESEN, Marcos et al. Soil conservation practices and greenhouse gases emissions in Brazil. Scientia Agropecuaria [online]. 2018, vol.9, n.3, pp.429-439. ISSN 2077-9917.  http://dx.doi.org/10.17268/sci.agropecu.2018.03.15.

In Brazil, more than 84% of N2O emissions and 74% of CH4 are produced by agriculture, and approximately 40% of the CO2 emitted originates from the use and change of land use and forest. It has been noticed a concern in several research institutions addressing this issue in order to improve the knowledge of the dynamics, as well as the main factors which drive the three main greenhouse gases (GHG) emissions. In this sense, sustainable technologies that follow the conservation agriculture premises show potential to mitigate the GHG emissions, as the no-tillage system (NTS), the use of cover crops, the use of integrated systems and other edaphic practices. Regarding the NTS, the CO2 retention in soil organic matter justifies the positive balance in soils managed under this system compared to conventional tillage. Usually undisturbed soils act as sink of CH4, however, the management NTS and conventional tillage still need more studies in order to evaluate its effects in N2O production. How the soil is managed, strongly affects the gases emission and the carbon balance, showing that the adoption of soil conservation practices, aiming to soil protection, are essential to mitigate the GHG

Palavras-chave : No-tillage; methane; management; carbon; integrated systems.

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