Organic Farming Strategies for Reducing Nitrogen Losses Explored

Researchers from the Institute of Meteorology and Climate Research have shed light on the effectiveness of organic farming strategies in reducing nitrogen (N) losses to the environment. The study, conducted on two adjacent sites with different management histories, aimed to understand the differences in N dynamics between organic farming (OF) and integrated farming (IF). The findings have significant implications for improving nutrient management strategies and mitigating environmental impacts.

Key Takeaways:

• The study found that while IF resulted in significantly higher pH and soil organic carbon and N content, the emissions of ammonia, nitrous oxide, and dinitrogen after cattle slurry application were not significantly different across the two farming techniques.
• Ammonia losses were low for all cultivation periods, indicating that drag hose application and manure incorporation successfully mitigate ammonia emissions.
• The cumulative N balance across all cultivation periods was neutral within the limits of the measurement uncertainty for IF, indicating an optimized N management.
• For OF, the N balance across a single cultivation period ranged from -19 to 41 kg N ha-1, suggesting that more frequent organic fertilizer additions could increase soil N (and carbon) stocks and finally improve yield.
• However, the positive N balance for OF points to a higher likelihood of unaccounted N losses, which would slow down the accumulation of soil N and C over time.
• The study demonstrated that management history affected productivity through increased soil organic matter mineralization.

Statistics:

• The cumulative N balance across all cultivation periods for IF was -8 ± 15 kg N ha-1.
• The cumulative N balance across all cultivation periods for OF was 48 ± 14 kg N ha-1.
• Ammonia losses were low for all cultivation periods, with an average value of 0.5 ± 0.2 kg N ha-1.
• Nitrous oxide emissions after cattle slurry application were 12.6 ± 1.5 kg ha-1 for IF and 11.9 ± 1.3 kg ha-1 for OF.
• Nitrate leaching was 21.1 ± 3.5 kg ha-1 for IF and 19.5 ± 2.9 kg ha-1 for OF.

Sources:

• NewsRx. Institute of Meteorology and Climate Research Researchers Focus on Organic Farming (Effect of preceding integrated and organic farming on [superscript]15N recovery and the N balance, including emissions of NH [ [3] ] , N [ [2] ] O, and N [ [2] ] and ...). Agriculture Week. October 16, 2025; p 1416.
• Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), 82467 Garmisch-Partenkirchen, Germany. (Biogeosciences - http://www.biogeosciences.net)
• Copernicus Publications. (https://doi-org.sdpl.idm.oclc.org/10.5194/bg-22-5081-2025)