Management Strategies to Mitigate N₂O Emissions in Agriculture

Area of Science:

• Agricultural Science
• Environmental Science
• Soil Science

Background:

• Greenhouse gas (GHG) concentrations, including nitrous oxide (N₂O), are rising due to industrialization.
• Agriculture is a primary source of N₂O emissions, a powerful GHG.
• Soil N₂O production is influenced by nitrification and denitrification, affected by soil temperature, moisture, carbon, nitrogen, and oxygen.

Purpose of the Study:

• To review mechanisms of N₂O emissions in agriculture.
• To evaluate agricultural practices for mitigating N₂O emissions.
• To identify effective strategies for reducing agricultural N₂O output.

Main Methods:

• Literature review of N₂O emission mechanisms.
• Analysis of factors influencing soil N₂O production (temperature, moisture, C, N, O).
• Evaluation of various agricultural management interventions for N₂O mitigation.

Main Results:

• N₂O emissions can be reduced by 30-80% through optimized N supply timing and methods.
• Amendments like biochar and lime, nitrification inhibitors, and arbuscular mycorrhizal fungi show significant N₂O reduction potential (up to 80%).
• Tillage, irrigation, crop rotation, and integrated nutrient management also influence N₂O emissions, though results can be variable.

Conclusions:

• Adjusting nitrogen (N) supply (type, dose, time, method) offers the most direct and effective N₂O reduction without yield loss.
• Implementing good agricultural practices in tillage, irrigation, and crop rotation is advisable for substantial N₂O abatement.
• Careful management is crucial to avoid unintended increases in N₂O emissions.