Localisation of nitrate in the rhizosphere of biochar-amended soils |
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| Authors: | Miranda T. Prendergast-Miller Michael Duvall |
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| Affiliation: | a UK Biochar Research Centre (UKBRC), School of GeoSciences, University of Edinburgh, Crew Building, The King’s Buildings, West Mains Rd, Edinburgh EH9 3JN, UK
b Centre for Soils and Ecosystem Function, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK |
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| Abstract: | 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 NO3− loss and improved nitrogen use efficiency. |
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| Keywords: | Biochar Nitrate Plant root architecture Charcoal Rhizosphere Rhizobox Nutrient availability |
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