130759 20240131210810.0 doi 10.1016/j.energy.2018.12.161 sideral 109708 ART-2019-109708 eng Juárez-Hernández, S. Assessing maize production systems in Mexico from an energy, exergy, and greenhouse-gas emissions perspective 2019 Maize is the most important staple crop in Mexico and is cultivated under varied agro-climatic and socio-economic conditions. The aim of this study is to estimate energy use, cumulative exergy consumption (CExC), and greenhouse gas (GHG) emissions of different maize production systems as proxies to compare their resource use and environmental performance. Based on average values, per-hectare energy use, energy intensity (EI), energy output-input ratio (ER), and net energy (NE) are in the range of 2.3–40.2 GJ ha-1, 1.8–8.5 MJ kg-1, 1.7–12.0, and 16.3–73.1 GJ ha-1, respectively. Per-hectare CExC, exergy intensity (ExI), exergy output-input ratio (ExR), and net exergy (NEx) are in the range of 2.5–52.1 GJ ha-1, 1.9–10.7 MJ kg-1, 1.6–14.1, and 19.6–86.8 GJ ha-1, respectively. Per-hectare GHG emissions, GHG intensity (GHGI), and GHG per unit energy input (GHGEi) are in the range of 152.9–3475.8 kg CO2e ha-1, 116.5–601.9 kg CO2e Mg-1, and 63.1–117.2 kg CO2e GJ-1, respectively. Low-input rain-fed production systems perform better in EI, ER, ExI, ExR, GHGI, and GHGEi though, they also show the lowest NE and NEx due to poor yields. High-input surface irrigated production systems have the highest NE and NEx coupled with medium values of EI, ExI, and GHGI due to high productivity. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 6.082 2019 THERMODYNAMICS 3 / 61 = 0.049 2019 Q1 T1 ENERGY & FUELS 20 / 112 = 0.179 2019 Q1 T1 2.166 2019 Electrical and Electronic Engineering 2019 Q1 Energy (miscellaneous) 2019 Q1 Energy Engineering and Power Technology 2019 Q1 Management, Monitoring, Policy and Law 2019 Q1 Civil and Structural Engineering 2019 Q1 Fuel Technology 2019 Q1 Industrial and Manufacturing Engineering 2019 Q1 Building and Construction 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Usón, S. Universidad de Zaragoza (orcid)0000-0002-9279-1959 Sheinbaum Pardo, C. 5004 590 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Máquinas y Motores Térmi. 170 (2019), 199-211 Energy Energy 0360-5442 2297898 http://zaguan.unizar.es/record/130759/files/texto_completo.pdf Postprint 964568 http://zaguan.unizar.es/record/130759/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:130759 articulos driver 2024-01-31-19:18:37 ARTICLE