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Does replacing chemical fertilizer with ryegrass (Lolium multiflorum Lam.) mitigate CH4 and N2O emissions and reduce global warming potential from paddy soil?
- Source :
- Plant & Soil; Feb2023, Vol. 483 Issue 1/2, p71-83, 13p, 4 Charts, 6 Graphs
- Publication Year :
- 2023
-
Abstract
- 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<subscript>4</subscript> and N<subscript>2</subscript>O emissions in a paddy soil. Methods: Gas samples for CH<subscript>4</subscript> and N<subscript>2</subscript>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<subscript>4</subscript> emission, but was negatively correlated with N<subscript>2</subscript>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 < 0.05). Soil redox, C and N remaining in litter residue were key characteristics explaining CH<subscript>4</subscript> emission, while NH<subscript>4</subscript><superscript>+</superscript>-N and NO<subscript>3</subscript><superscript>−</superscript>-N were correlated with N<subscript>2</subscript>O emission. Conclusion: The increased GWP by CH<subscript>4</subscript> emission after RG incorporation could be offset by N<subscript>2</subscript>O reduction when RG-urea substitution ratio was 50% or less. [ABSTRACT FROM AUTHOR]
- Subjects :
- ITALIAN ryegrass
FERTILIZERS
GREENHOUSE gases
RYEGRASSES
CORPORATE purposes
SOILS
Subjects
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 483
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 161960921
- Full Text :
- https://doi.org/10.1007/s11104-022-05725-6