Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 43, Issue 11, Pages 2243-2246Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2011.07.019
Keywords
Biochar; Nitrate; Plant root architecture; Charcoal; Rhizosphere; Rhizobox; Nutrient availability
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Funding
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/F034520/1]
- Scottish Funding Council (SFC)
- BBSRC
- Lawes Agricultural Trust
- EPSRC [EP/F034520/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F034520/1] Funding Source: researchfish
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A wheat seedling rhizobox approach was used to differentiate between the rhizosphere and non-rhizosphere (bulk) soil amended with low and high rates of biochar (20 and 60 t ha(-1) vs. control). Nitrate (NO3-) was added as the main nitrogen (N) source because emerging biochar research points to reduced NO3- loss through leaching and gaseous loss as nitrous oxide. The rhizosphere under the different treatments were distinct (P = 0.021), with greater soil-NO3- and biochar-NO3- contents in the high biochar treatment. Biochar addition increased wheat root length ratio (P = 0.053) and lowered root N uptake (P = 0.017), yet plant biomass and N content were similar between treatments. The results indicate localisation of NO3- within the rhizosphere of biochar-amended soils which has implications for No-3(-) loss and improved nitrogen use efficiency. (C) 2011 Elsevier Ltd. All rights reserved.
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