Meta-analysis of yield and nitrous oxide outcomes for nitrogen management in agriculture

© 2021 The Authors. Global Change Biology published by John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 27(2021), 11 vom: 08. Juni, Seite 2343-2360
1. Verfasser: Maaz, Tai M (VerfasserIn)
Weitere Verfasser: Sapkota, Tek B, Eagle, Alison J, Kantar, Michael B, Bruulsema, Tom W, Majumdar, Kaushik
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Meta-Analysis 4R N2O agriculture balance emissions management rice subtropical mehr... yield Fertilizers Soil Nitrous Oxide K50XQU1029 Nitrogen N762921K75
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520 |a Improved nitrogen (N) use is key to future food security and environmental sustainability. While many regions still experience N shortages, agriculture is the leading global emitter of N2 O due to losses exacerbated by N surpluses in other regions. In order to sustainably maintain or increase food production, farmers and their advisors need a comprehensive and actionable understanding of how nutrient management affects both yield and N2 O emissions, particularly in tropical and subtropical agroecosystems. We performed a meta-analysis to determine the effect of N management and other factors on N2 O emissions, plant N uptake, and yield. Our analysis demonstrates that performance indicators-partial N balance and partial factor productivity-predicted N2 O emissions as well as or better than N rate. While we observed consistent production and environmental benefits with enhanced-efficiency fertilizers, we noted potential trade-offs between yield and N2 O emissions for fertilizer placement. Furthermore, we observed confounding effects due to management dynamics that co-vary with nutrient application practices, thus challenging the interpretation of the effect of specific practices such as fertilization frequency. Therefore, rather than providing universally prescriptive management for N2 O emission reduction, our evidence supports mitigation strategies based upon tailored nutrient management approaches that keep N balances within safe limits, so as to minimize N2 O emissions while still achieving high crop yields. The limited evidence available suggests that these relationships hold for temperate, tropical, and subtropical regions, but given the potential for expansion of N use in crop production, further N2 O data collection should be prioritized in under-represented regions such as Sub-Saharan Africa 
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700 1 |a Sapkota, Tek B  |e verfasserin  |4 aut 
700 1 |a Eagle, Alison J  |e verfasserin  |4 aut 
700 1 |a Kantar, Michael B  |e verfasserin  |4 aut 
700 1 |a Bruulsema, Tom W  |e verfasserin  |4 aut 
700 1 |a Majumdar, Kaushik  |e verfasserin  |4 aut 
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