Nitrification in agricultural soils: impact, actors and mitigation

Area of Science:

• Agricultural Science
• Environmental Science
• Microbiology

Background:

• Nitrogen fertilization is crucial for plant growth but leads to significant nitrogen loss through nitrification.
• Nitrification results in nitrate leaching, causing water eutrophication and biodiversity loss.
• Nitrous oxide, a byproduct of nitrification, is a potent greenhouse gas, contributing to climate change.

Purpose of the Study:

• To review the current understanding of nitrification pathways, focusing on ammonia-oxidizing archaea and comammox bacteria.
• To assess the effectiveness of nitrification inhibitors in agricultural systems.
• To identify strategies for optimizing nitrification inhibition for improved nitrogen use efficiency and reduced environmental impact.

Main Methods:

• Literature review of scientific publications on nitrification, ammonia oxidation, and nitrification inhibitors.
• Analysis of the roles of ammonia-oxidizing archaea and comammox bacteria in the nitrogen cycle.
• Synthesis of information on the interaction between nitrification inhibitors and various microbial players.

Main Results:

• Ammonia-oxidizing archaea and comammox bacteria are significant contributors to nitrification and warrant further investigation.
• Current nitrification inhibitors may have varying efficacy against these newly identified microbial groups.
• Optimizing nitrification inhibition requires a deeper understanding of the diverse microbial communities involved.

Conclusions:

• Targeting ammonia-oxidizing archaea and comammox bacteria could enhance nitrification inhibition strategies.
• More research is needed to develop effective nitrification inhibitors for all relevant microbial groups.
• Improved nitrification inhibition can lead to more sustainable agricultural practices and reduced environmental pollution.