Publication Date: 2017.
Nitrous oxide (N2O) is the main greenhouse gas emitted from farming systems and is associated with nitrogen (N) fertilizer application as well as decomposition of organic matter present in the environment. The objective of this study was to determine the effect of post-harvest straw burning and synthetic N fertilization on the dynamics of N2O emissions in the sugarcane-soil system in Tucuman, Argentina, compared with a native forest. Close-vented chambers were used to capture N2O during three consecutive growing seasons. The highest N2O emissions from the sugarcane-soil system coincided with the period of high soil and air temperatures, rainfall and soil N content. The effect of synthetic N fertilization on annual cumulative N2O emission was 7.4–61.5% higher in straw burned than in unburned treatments, especially during a wet growing season. There was a significant effect of treatments on N2O emission factors among growing seasons: 0.58–1.67% and 0.94–3.34% in the unburnt and burnt treatments, respectively. The emission factors for sugarcane are highly dependent on rainfall, temperature and crop management practices; regarding the latter, avoiding straw burning and reducing N soil availability, assessing alternative N fertilizers or new application modes such as split rates, seem to be the key for mitigating N2O emissions from the sugarcane-soil system in Tucumán, Argentina.
Inst. de Clima y Agua
Author affiliation: Chalco Vera, Jorge Elias. INTA. Estación Experimental Agropecuaria Famaillá; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Author affiliation: Valeiro, Alejandro Hector. INTA. Estación Experimental Agropecuaria Famaillá; Argentina.
Author affiliation: Posse Beaulieu, Gabriela. INTA. Centro de Investigaciones en Recursos Naturales. Instituto de Clima y Agua; Argentina
Author affiliation: Acreche, Martin Moises. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. INTA. Estación Experimental Agropecuaria Salta; Argentina
Repository: INTA Digital (INTA). Instituto Nacional de Tecnología Agropecuaria