Soil N2 O emissions from specialty crop systems: A global estimation and meta-analysis
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View abstract on PubMed
Summary
This summary is machine-generated.Agricultural management significantly impacts nitrous oxide (N<sub>2</sub> O) emissions from specialty crops. This study estimates global N<sub>2</sub> O emissions and identifies strategies to mitigate them.
Area Of Science
- Agricultural Science
- Environmental Science
- Soil Science
Background
- Nitrous oxide (N<sub>2</sub> O) is a potent greenhouse gas contributing to global warming.
- Agricultural practices, particularly nitrogen (N) fertilizer use and irrigation, are major sources of soil N<sub>2</sub> O emissions.
- Specialty crop systems, vital to global agriculture, often involve intensive management and have not been comprehensively assessed for N<sub>2</sub> O emissions.
Approach
- A meta-analysis synthesized 1137 observations from 114 published studies.
- Evaluated the impact of agricultural management and environmental factors on soil N<sub>2</sub> O emissions.
- Estimated global soil N<sub>2</sub> O emissions from specialty crop systems.
Key Points
- Global N<sub>2</sub> O emission from specialty crop soils is estimated at 1.5 Tg N<sub>2</sub> O-N year<sup>-1</sup>.
- Soil N<sub>2</sub> O emissions increase exponentially with N fertilizer rates.
- Emissions are influenced by temperature, precipitation, soil organic carbon, and pH; climate change may intensify these effects.
Conclusions
- Drip irrigation, fertigation, and reduced tillage can mitigate N<sub>2</sub> O emissions while enhancing crop yields.
- Deficit irrigation and non-legume cover crops reduce N<sub>2</sub> O emissions but may impact yields.
- Biochar shows limited N<sub>2</sub> O reduction potential but can improve crop yields, offering effective strategies for reducing agricultural N<sub>2</sub> O emissions.
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