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Biochar's Effect on Soil Nitrous Oxide Emissions from a Maize Field with Lime-adjusted Ph Treatment : Volume 2, Issue 2 (27/07/2015)

By Hüppi, R.

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Book Id: WPLBN0004022352
Format Type: PDF Article :
File Size: Pages 31
Reproduction Date: 2015

Title: Biochar's Effect on Soil Nitrous Oxide Emissions from a Maize Field with Lime-adjusted Ph Treatment : Volume 2, Issue 2 (27/07/2015)  
Author: Hüppi, R.
Volume: Vol. 2, Issue 2
Language: English
Subject: Science, Soil, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Felber, R., Neftel, A., Six, J., Leifeld, J., & Hüppi, R. (2015). Biochar's Effect on Soil Nitrous Oxide Emissions from a Maize Field with Lime-adjusted Ph Treatment : Volume 2, Issue 2 (27/07/2015). Retrieved from

Description: Climate and Air Pollution Group, Agroscope Research Station Zurich, Zürich, Switzerland. Biochar, a carbon-rich, porous pyrolysis product of organic residues may positively affect plant yield and can, owing to its inherent stability, promote soil carbon sequestration when amended to agricultural soils. Another possible effect of biochar is the reduction in emissions of nitrous oxide (N2O). A number of laboratory incubations have shown significantly reduced N2O emissions from soil when mixed with biochar. Emission measurements under field conditions however are more scarce and show weaker or no reductions, or even increases in N2O emissions. One of the hypothesized mechanisms for reduced N2O emissions from soil is owing to the increase in soil pH following the application of alkaline biochar. To test the effect of biochar on N2O emissions in a temperate maize system, we set up a field trial with a 20 t ha−1 biochar treatment, a limestone treatment adjusted to the same pH as the biochar treatment, and a control treatment without any addition. An automated static chamber system measured N2O emissions for each replicate plot (n = 3) every 3.6 h over the course of 8 months. The field was conventionally fertilised at a rate of 160 kg-N ha−1 in 3 applications of 40, 80 and 40 kg-N ha−1.

Cumulative N2O emissions were 53 % smaller in the biochar compared to the control treatment. However, the effect of the treatments overall was not statistically significant (p = 0.26) because of the large variability in the dataset. Limed soils emitted similar mean cumulative amounts of N2O as the control. This indicates that the observed N2O reduction effect of biochar was not caused by a pH effect.

Biochar's effect on soil nitrous oxide emissions from a maize field with lime-adjusted pH treatment

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