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Organic coating on biochar explains its nutrient retention and stimulation of soil fertility

Title data

Hagemann, Nikolas ; Joseph, Stephen ; Schmidt, Hans-Peter ; Kammann, Claudia ; Harter, Johannes ; Borch, Thomas ; Young, Robert B. ; Varga, Krisztina ; Taherymoosavi, Sarasadat ; Elliott, K. Wade ; McKenna, Amy ; Albu, Mihaela ; Mayrhofer, Claudia ; Obst, Martin ; Conte, Pellegrino ; Dieguez-Alonso, Alba ; Orsetti, Silvia ; Subdiaga, Edisson ; Behrens, Sebastian ; Kappler, Andreas:
Organic coating on biochar explains its nutrient retention and stimulation of soil fertility.
In: Nature Communications. Vol. 8 (2017) Issue 1 . - No. 1089.
ISSN 2041-1723
DOI: https://doi.org/10.1038/s41467-017-01123-0

Abstract in another language

Amending soil with biochar (pyrolized biomass) is suggested as a globally applicable approach to address climate change and soil degradation by carbon sequestration, reducing soil-borne greenhouse-gas emissions and increasing soil nutrient retention. Biochar was shown to promote plant growth, especially when combined with nutrient-rich organic matter, e.g., co-composted biochar. Plant growth promotion was explained by slow release of nutrients, although a mechanistic understanding of nutrient storage in biochar is missing. Here we identify a complex, nutrient-rich organic coating on co-composted biochar that covers the outer and inner (pore) surfaces of biochar particles using high-resolution spectro (micro)scopy and mass spectrometry. Fast field cycling nuclear magnetic resonance, elec- trochemical analysis and gas adsorption demonstrated that this coating adds hydrophilicity, redox-active moieties, and additional mesoporosity, which strengthens biochar- water interactions and thus enhances nutrient retention. This implies that the functioning of biochar in soil is determined by the formation of an organic coating, rather than biochar surface oxidation, as previously suggested.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER143129
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg-Professur Experimentelle Biogeochemie > Heisenberg-Professur Experimentelle Biogeochemie - Univ.-Prof. Dr. Martin Obst
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg-Professur Experimentelle Biogeochemie
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Jan 2018 09:30
Last Modified: 31 Jan 2018 12:56
URI: https://eref.uni-bayreuth.de/id/eprint/41112