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• W2620340086 abstract "Biochar has been shown to reduce soil emissions of CO2, CH4 and N2O in short-term incubation and greenhouse experiments. Such controlled experiments failed to represent variable field conditions, and rarely included crop growth feedback. The objective of this study was to assess the effect of biochar, in comparison to green manure and mineral nitrogen, on greenhouse gas Emissions Intensity (EI = emissions in CO2 equivalents per ton of grain yield) in a low-fertility tropical Ultisol. Using a field trial in western Kenya, biochar (0 and 2.5 t ha−1; made from Eucalyptus wood) was integrated with urea (0 and 120 kg N ha−1) and green manure (Tithonia diversifolia; 0, 2.5 and 5 t ha−1) in a factorial design for four consecutive seasons from October 2012 to August 2014. Compared to the control, biochar increased soil CO2 emissions (9–33%), reduced soil CH4 uptake (7–59%) and reduced soil N2O emissions (1–42%) in each season, with no seasonal differences. N2O emissions increased following amendment with T. diversifolia (6%) and urea (13%) compared to the control. Generally, N2O emissions decreased where only biochar was applied. The greatest decrease in N2O (42%) occurred where all three amendments were applied compared to when they were added separately. EI in response to any of the amendments was lower than the control, ranging from 9 to 65% (33.0 ± 3.2 = mean ± SE). The amendments increased SOC stocks by 0.1–1.2 t ha−1 year−1 (mean ± SE of 0.8 ± 0.09 t ha−1 year−1). The results suggest decreased net EI with biochar in low fertility soils mainly through greater net primary productivity (89% of the decrease)." @default.
• W2620340086 created "2017-06-05" @default.
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• W2620340086 date "2017-08-01" @default.
• W2620340086 modified "2023-10-07" @default.
• W2620340086 title "Emissions intensity and carbon stocks of a tropical Ultisol after amendment with Tithonia green manure, urea and biochar" @default.
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• W2620340086 doi "https://doi.org/10.1016/j.fcr.2017.05.013" @default.
• W2620340086 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5473158" @default.
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