Carbon Footprint of Mixed Farming and Grazing Beef Systems Using Long-Term Data

Jenn Hoskins
16th July, 2024

Carbon Footprint of Mixed Farming and Grazing Beef Systems Using Long-Term Data

Image Source: Ann H (photographer)

Key Findings

  • The study evaluated greenhouse gas (GHG) emissions of different rotational crop-livestock systems in Uruguay
  • Continuous cropping had the lowest emissions at 11.3 kg CO2-eq/kg of liveweight gain (LWG), while forage rotation had the highest at 16.4 kg CO2-eq/kg/LWG
  • Including soil organic carbon stock changes reduced emissions by 22.4% to 42.1% across all systems, highlighting the importance of soil management in mitigating GHG emissions
In an era of increasing food demand and environmental concerns, the sustainability of agricultural systems is under scrutiny. High-input farming, characterized by intensive use of resources, has been linked to significant greenhouse gas (GHG) emissions. Mixed crop-livestock systems are emerging as a potential solution to enhance sustainability. However, assessing these systems is complex and requires detailed data. A recent study by the Instituto Nacional de Investigación Agropecuaria[1] aimed to evaluate the GHG emissions of different rotational crop-livestock systems in South America using high-resolution data from 2019 to 2022. The study focused on four systems: continuous cropping, short rotation (2-year continuous cropping plus 2-year pasture), long rotation (2-year continuous cropping followed by 4-year pasture), and forage rotation (continuous pasture). Emissions were measured in kilograms of carbon dioxide equivalents (CO2-eq) per kilogram of liveweight gain (LWG) for beef production. The results showed emissions of 11.3, 11.8, 11.8, and 16.4 kg CO2-eq/kg/LWG for continuous cropping, short rotation, long rotation, and forage rotation, respectively. When soil organic carbon stock changes were included, emissions were reduced by 22.4%, 19.2%, 25.3%, and 42.1% for the respective systems. This study's findings are significant in the context of the United Nations Framework Convention on Climate Change (UNFCCC), where GHG emissions are reported in terms of CO2-equivalent (CO2-e)[2]. The conventional usage of CO2-e does not adequately capture the different behaviors of long-lived climate pollutants (LLCPs) and short-lived climate pollutants (SLCPs). The study's use of the Intergovernmental Panel for Climate Change’s Sixth Assessment Report (AR6 2021) CO2 characterization factors aligns with the evolving understanding of GHG emissions and their impact on global warming. The study also contributes to the ongoing debate about the environmental impact of different types of meat production. Previous research has highlighted the high carbon footprint of beef compared to other protein sources[3]. However, this new study underscores the importance of considering the entire production system, including crop rotations and pasture management, when assessing environmental impacts. For example, the inclusion of soil organic carbon stock changes significantly reduced the emissions for all systems evaluated, highlighting the potential of soil management practices to mitigate GHG emissions. Moreover, the study's findings align with earlier research on the environmental impacts of pork production[4]. The life-cycle assessment of pig farms in Ireland revealed that higher production efficiency could reduce GHG emissions. Similarly, the current study demonstrates that mixed crop-livestock systems, particularly those incorporating longer pasture rotations, can effectively lower emissions by enhancing soil carbon sequestration. In summary, this study by the Instituto Nacional de Investigación Agropecuaria provides valuable insights into the environmental sustainability of mixed crop-livestock systems. By using high-resolution data and considering soil organic carbon stock changes, the research offers a more comprehensive assessment of GHG emissions. These findings support the potential of mixed systems to deliver greater sustainability compared to mono-enterprise production systems, contributing to the broader goal of reducing the environmental impact of agriculture.

AgricultureEnvironmentSustainability

References

Main Study

1) Carbon footprint of mixed farming crop-livestock rotational-based grazing beef systems using long term experimental data

Published 15th July, 2024

https://doi.org/10.1007/s13593-024-00977-1

Related Studies

2) Improved calculation of warming-equivalent emissions for short-lived climate pollutants.

https://doi.org/10.1038/s41612-019-0086-4

3) Nutritional value of suckler beef from temperate pasture systems.

https://doi.org/10.1016/j.animal.2021.100257

4) Environmental trade-offs of pig production systems under varied operational efficiencies.

https://doi.org/10.1016/j.jclepro.2017.07.191


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