Abstract

ACOSTA SOTELO, Laura Liliana et al. Bagasse and bagasse compost from agave tequilero in contrasting soils: 3. Soil respiration and greenhouse gas emissions. Biotecnia [online]. 2024, vol.26, e2178.  Epub Nov 08, 2024. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v26.2178.

The study of soil respiration (microbial CO2 emission) due to the incorporation of organic waste (RO) from agroindustry (bagasse and bagasse compost), allows estimating the environmental effect in relation to the CO2 emission, due to carbon mineralization during its decomposition process, which must be considered from the climate change point of view. Therefore, the objective was to evaluate the CO2 emission dynamics due to the mineralization of four lignocellulosic materials, incorporated into soils of different textures. Using the alkaline respiration technique, CO2 respiration was quantified in Regosol and Luvisol by incorporating two bagasse (TBD and TBA) and their composts (TCD and TCA) for 30 d under controlled humidity and temperature conditions. The TBD and TBA treatments increased microbiological activity with higher emissions, while the TCD and TCA treatments increased the soil organic C (COS) content with lower emissions. The CO2 emission was related to the mineralization of the RO and this in turn to its chemical composition and resistance to decomposition; in addition, the dynamics of the emissions were different by type of material and of soil. The incorporation of bagasse type RO is an option to increase soil microbial activity, but with greater greenhouse gas (GHG) emissions; while composted RO generates an increase in the capture of COS and, therefore, a greater store of C and a lower emission of CO2.

Keywords : organic waste; mineralization rate; carbon kinetics.

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