Does replacing chemical fertilizer with ryegrass (Lolium multiflorum Lam.) mitigate CH4 and N2O emissions and reduce global warming potential from paddy soil?

Purpose The incorporation of ryegrass ( Lolium multiflorum Lam.; RG), a winter manure, could partly replace chemical N and reduce N loss during the succeeding rice seasons, but little is known about its impact on greenhouse gas emission. This study investigated the effect of different RG-urea substi...

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Bibliographic Details
Published in:Plant and soil 2023-02, Vol.483 (1-2), p.71-83
Main Authors: Yang, Wei, Yao, Lai, Ji, Xueru, Zhu, Mengzhen, Li, Chengwei, Li, Shaoqiu, Wang, Bin, Liu, Zhangyong, Zhu, Bo
Format: Article
Language:English
Subjects:
Agriculture
Agrochemicals
Biomedical and Life Sciences
Climate change
Decay
Ecology
Emission analysis
Emissions
Finite element method
Gas sampling
Global warming
Greenhouse effect
Greenhouse gases
Life Sciences
Lolium multiflorum
Methane
Mineralization
Nitrous oxide
Plant Physiology
Plant Sciences
Research Article
Residues
Rice fields
Soil Science & Conservation
Soils
Substitutes
Urea
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Summary:Purpose The incorporation of ryegrass ( Lolium multiflorum Lam.; RG), a winter manure, could partly replace chemical N and reduce N loss during the succeeding rice seasons, but little is known about its impact on greenhouse gas emission. This study investigated the effect of different RG-urea substitution ratios (0% RG and 100% urea, 25% RG and 75% urea, 50% RG and 50% urea, 75% RG and 25% urea, 100% RG and 0% urea,) on net C and N mineralization, CH 4 and N 2 O emissions in a paddy soil. Methods Gas samples for CH 4 and N 2 O fluxes were collected by using a closed chamber and determined by chromatograph method. Net C and N mineralization from the incorporated RG residue were tested by a mesh bag method. Results Net C and N mineralization from RG followed a single exponential decay model, with 95.5%-97.8% of the original C and 98.7%-99.3% of N released during 192 days. The RG-urea substitution ratio increased CH 4 emission, but was negatively correlated with N 2 O emission. In comparison with 0% substitution, global warming potential (GWP) and greenhouse gas intensity (GHGI) were not significantly different for the 25% and 50% RG substitutions, but were significantly higher for the 75% and 100% substitutions ( P  
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-022-05725-6