Manure management for greenhouse gas mitigation.

Area of Science:

• Agricultural Science
• Environmental Science
• Microbiology

Background:

• Intensified livestock production generates large manure volumes, a primary source of methane (CH4) and nitrous oxide (N2O) emissions.
• Microbial activities within manure dictate net GHG emissions, influenced by manure composition, management practices, and climate.
• Global livestock systems vary in intensification and regulatory priorities, impacting manure management strategies.

Purpose of the Study:

• To analyze greenhouse gas (GHG) mitigation options for diverse livestock production systems.
• To explore interactions between pollutants and management practices for effective GHG reduction.
• To discuss the necessity and requirements for a modeling approach to estimate GHG emissions and predict mitigation effects.

Main Methods:

• Comparative analysis of manure management across four diverse global regions (Sub-Saharan Africa, Southeast Asia, China, Europe).
• Identification and discussion of GHG mitigation strategies for both solid and liquid manure.
• Exploration of potential synergistic and antagonistic interactions between different pollutants and management practices.

Main Results:

• Livestock manure is a major source of methane and nitrous oxide, with emissions dependent on manure characteristics, management, and climate.
• Regional case studies reveal diverse manure management practices and regulatory priorities.
• GHG mitigation potentials are highest in intensive production systems, where future livestock growth is projected.

Conclusions:

• Effective manure management is crucial for reducing greenhouse gas emissions from livestock production.
• A modeling approach is necessary to accurately estimate GHG emissions and predict the impact of management changes.
• Reducing GHG emissions from manure is compatible with improving food and feed production, particularly in intensive systems.