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| Hüppi, Roman; Neftel, Albrecht; Lehmann, Moritz F.; Krauss, Maike; Six, Johan; Leifeld, Jens. |
| Biochar, a carbon-rich, porous pyrolysis product of organic residues, is evaluated as an option to tackle major problems of the global food system. Applied to soil, biochar can sequester carbon and have beneficial effects on nitrogen (N) cycling, thereby enhancing crop yields and reducing nitrous oxide (N2O) emissions. There is little understanding of the underlying mechanisms, but many experiments indicated increased yields and manifold changes in N transformation, suggesting an increase in N use efficiency. Biochar's effects can be positive in extensively managed tropical agriculture, however less is known about its use in temperate soils with intensive fertilisation. We tested the effect of slow pyrolysis wood chip biochar on N use efficiency, crop... |
| Tipo: Journal paper |
Palavras-chave: Soil quality Cereals; Pulses and oilseeds Air and water emissions. |
| Ano: 2016 |
URL: http://orgprints.org/34685/1/hueppi_etal-2016_EnvironResLett-Vol11-p084013.pdf |
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| Norah, Efosa; Krause, Hans-Martin; Bünemann, Else K.; Hüppi, Roman; Häni, Christoph; Six, Johan. |
| Background Nitrogen (N) fertilizers are essential for crop production. Farmyard manure and slurry traditionally constitute about half of the total N inputs into crop production in Switzerland. Recycled fertilizers such as biogas slurry, liquid digestates and compost enable simultaneous energy production and closing of nutrient cycles. There is evidence that recycled fertilizers can help to increase N use efficiencies and to improve N supply in organic farming. Biochar amendment has shown a potential to mitigate soil greenhouse gas (GHG) emissions, in particular nitrous oxide (N2O) emissions. Here, we combine one of the liquid recycled fertilizer treatments with biochar. In a 2.5-years on-farm experiment, we quantify GHG emissions and further gaseous... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions; Soil. |
| Ano: 2018 |
URL: http://orgprints.org/33934/1/Poster_Climate_effects_NEfosa_2018.pdf |
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| Krause, Hans-Martin; Hüppi, Roman; Leifeld, Jens; El-Hadidi, Mohamed; Harter, Johannes; Kappler, Andreas; Hartmann, Martin; Behrens, Sebastian; Mäder, Paul; Gattinger, Andreas. |
| N2O is a major greenhouse gas and the majority of anthropogenic N2O emissions originate from agriculturally managed soils. Therefore, developing N2O mitigation strategies is a key challenge for the agricultural sector and biochar soil treatment is one reported option. Biochar's capacity to increase soil pH and to foster activity of specialized N2O reducers has been proposed as possible mechanisms for N2O mitigation. An experiment was undertaken to investigate whether changes in the community composition of N2O reducers was observed under field conditions after biochar application. The study objective was to assess the abundance and taxonomic composition of the functional marker genes nosZ and nosZ –II across a vegetation period of Zea mays L. after biochar... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Crop husbandry. |
| Ano: 2018 |
URL: http://orgprints.org/32767/1/krause-etal-2018-SoilBiolBiochem-vol119-p143-151.pdf |
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| Hüppi, Roman; Felber, Raphael; Krauss, Maike; Six, Johan; Leifeld, Jens; Fuß, Roland. |
| The static chamber approach is often used for greenhouse gas (GHG) flux measurements, whereby the flux is deduced from the increase of species concentration after closing the chamber. Since this increase changes diffusion gradients between chamber air and soil air, a nonlinear increase is expected. Lateral gas flow and leakages also contribute to non linearity. Several models have been suggested to account for this non linearity, the most recent being the Hutchinson±Mosier regression model (HMR). However, the practical application of these models is challenging because the researcher needs to decide for each flux whether a nonlinear fit is appropriate or exaggerates flux estimates due to measurement artifacts. In the latter case, a flux estimate from the... |
| Tipo: Journal paper |
Palavras-chave: Specific methods; Air and water emissions. |
| Ano: 2018 |
URL: http://orgprints.org/34683/1/hueppi_etal_2018_PlosOne_Vol13_Issue7-p1-17.pdf |
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