Abstract

CHALCO VERA, Jorge  and  ACRECHE, M.M.. Emisiones provinciales de gases con efecto invernadero del sistema suelo-caña de azúcar de Tucumán. RIA. Rev. investig. agropecu. [online]. 2020, vol.46, n.3, pp.339-346. ISSN 1669-2314.

Estimations of greenhouse gases (GHG) emissions from agricultural soils reported in the latest Biennial Update Report of Argentina of 2017 present great uncertainty because they are based on IPCC emission factors and not on direct field measurements. This limits the ability for planning a sustainable development of low GHG emissions. The objective of this work was to quantify the GHG emissions of sugarcane measured for the province of Tucumán and compare them with the emissions determined following the IPCC protocol. The quantification and analysis of GHG emissions was carried out by extrapolation and interpolation of mean flows measured in the field during the 2013-2014 and 2014-2015. The total emissions of GHG (CH. + N.O) from sugarcane in Tucumán were 343.6 and 404.9 Gg CO. eq. for the 2013-2014 (normal to dry) and 2014-2015 (wet) growing seasons, respectively. It was shown that, in a growing season of modal rainfall: i) the IPCC overestimated provincial emissions by 18.4%; and ii) a decrease in the burned area increased the overestimation by the IPCC. The most important gap with the IPCC was given by straw management and the emissions during the growing season. The prevention of straw burning effectively leads to a reduction in total GHG emissions from the sugarcane-soil system of Tucumán, which can reverse the adverse effect on the increase of total GHG emissions from extreme events of high rainfall.

Keywords : bioethanol; climate change; methane; mitigation; nitrous oxide..

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