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Assessing the potential of alternative farming practices for sustainable energy and water use and GHG mitigation in conventional maize systems

Author

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  • Sergio Juárez-Hernández

    (UNAM)

  • Claudia Sheinbaum Pardo

    (UNAM)

Abstract

Conventional maize systems in Mexico rely heavily on synthetic fertilizers, diesel, and fossil-derived electricity and demand large amounts of irrigation water due to extensive use of low-efficiency furrow irrigation methods. These considerations raise concerns about the sustainability of conventional farming methods for growing maize, a staple crop for Mexican people. The present study evaluates potential energy, greenhouse gas (GHG) emissions, and irrigation water savings in conventional high-input maize systems in Mexico resulting from introducing alternative farming practices. Six different alternative practices related to soil, nutrient, and irrigation management were evaluated using literature data about expected changes in crop input rates and field operations performed. Overall, energy intensity (EI, GJ Mg−1 of grain) varied by − 28% to + 33%, GHG intensity (GHGI, kg-CO2e Mg−1 of grain) by − 14% to + 14%, and irrigation water productivity (IWP, kg-grain m−3 of applied irrigation) by + 12% to + 88% under the different alternative practice scenarios. Partly replacing synthetic N fertilizer with animal manure or legume green manure and improving N fertilizer use efficiency provided the largest potential savings in EI. Improving N fertilizer use efficiency led to the greatest potential reductions in GHGI, while converting to pressurized irrigation methods and switching to reduced tillage caused the major potential increases in IWP due to irrigation water minimization. Results provide a good proxy for the impacts of resource-conserving practices on the energy, GHG, and irrigation water budgets of conventional maize systems and can inform decisions about effective management changes to make maize farming more sustainable.

Suggested Citation

  • Sergio Juárez-Hernández & Claudia Sheinbaum Pardo, 2020. "Assessing the potential of alternative farming practices for sustainable energy and water use and GHG mitigation in conventional maize systems," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 22(8), pages 8029-8059, December.
    • Handle: RePEc:spr:endesu:v:22:y:2020:i:8:d:10.1007_s10668-019-00559-2
    DOI: 10.1007/s10668-019-00559-2
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    1. Alberto Santillán-Fernández & Yolanda Salinas-Moreno & José René Valdez-Lazalde & Mauricio Antonio Carmona-Arellano & Javier Enrique Vera-López & Santiago Pereira-Lorenzo, 2021. "Relationship between Maize Seed Productivity in Mexico between 1983 and 2018 with the Adoption of Genetically Modified Maize and the Resilience of Local Races," Agriculture, MDPI, vol. 11(8), pages 1-15, August.

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