Abstract

BENEDICTO-VALDES, Gerardo Sergio et al. Incorporation of organic fertilizers and release of C-CO₂ as an indicator of carbon mineralizaron. Ecosistemas y recur. agropecuarios [online]. 2019, vol.6, n.18, pp.513-522.  Epub Feb 20, 2020. ISSN 2007-901X.  https://doi.org/10.19136/era.a6n18.2022.

Sustainable agriculture promotes the reduction of chemical fertilizers with organic waste and increases soil fertility. With the incorporation of organic waste, a poorly evaluated effect is the emission of CO2 which would be an indicator of carbon mineralization and nutrient release for crops. The objective of this study was to assess the incorporation of three organic fertilizers: goat manure (GM), bovine manure (BM) and chicken manure (CM), with two doses of 4.5 and 9.0 kg m-2, to determine the release and accumulation of C-CO2 under laboratory conditions for 95 days. BM applications increased the pH, electrical conductivity, organic carbon, total nitrogen, and CO2 emission and release compared to the other fertilizers. Greater effects were observed for organic fertilizers at a depth of 0 to 15 cm in all study variables. CO2 accumulation is related to carbon mineralization, which was higher in BM followed by CM and GM. The addition of BM to the soil is an option to increase carbon mineralization and maintain crop productivity in a sustainable manner.

Keywords : Organic fertilizers; incubation; CO₂ release; mineralization rate.