Abstract

FERNANDEZ-RODRIGUEZ, Damián et al. Impact on global warming in the application of compost "alperujo" in aerobic rice cultivation. Rev. de Ciências Agrárias [online]. 2022, vol.45, n.4, pp.501-510.  Epub Dec 01, 2022. ISSN 0871-018X.  https://doi.org/10.19084/rca.28501.

Traditional rice cultivation (tillage and flooding) is one of the most important anthropogenic sources of greenhouse gas (GHG) emissions, especially CH4 and N2O. Therefore, it is necessary to develop new management techniques that can mitigate this problem. The objective of the present work was to evaluate the effect of the different handlings in aerobic conditions; tillage (T) and its counterpart with compost (TC), non-tillage (NT) and its counterpart with compost (NTC), exert on the CO2 balance. To do this, a three-year field experiment (2015-2017) was carried out, where GHG emissions and TOC levels present in soils were measured throughout the crop cycle. The global warming potential (GWP) was 1.19 times higher in T compared to NT. So that the net balance between emissions and fixations in TC was 8.96 Mg of CO2 ha-1, being in T, NTC and NT -7.37, -6.74 and -15.5 Mg of CO2 ha-1, respectively. Therefore, the implementation of NT can be an efficient strategy to help reduce the GWP and improve the net balance of CO2 in rice crop.

Keywords : arroz; aeróbico; potencial de calentamiento global; agricultura de conservación; fijación CO₂; rice; aerobic; global warming potential; conservation of agriculture; fixations CO₂.

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