Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/16187
Title: A glasshouse study on the interaction of low mineral ash biochar with nitrogen in a sandy soil
Contributor(s): Van Zwieten, Lukas  (author); Kimber, S (author); Downie, A (author); Morris, S (author); Petty, S (author); Rust, J (author); Chan, K Y (author)
Publication Date: 2010
DOI: 10.1071/SR10003
Handle Link: https://hdl.handle.net/1959.11/16187
Abstract: The effect of a low mineral ash biochar on biomass production and nitrogen (N) uptake into plants was tested with wheat and radish in a Yellow Earth used for commercial vegetable production. The biochar had an acid neutralising capacity <0.5% CaCO₃, a total C content of 75%, and a molar H/C ratio of 0.45, indicating stability due to its aromaticity. A pot trial was established under climate-controlled conditions. Five rates of N fertiliser (0, 17, 44, 88, 177 kg N/ha) were applied as urea in combination with 5 biochar rates (0, 1.1, 2.2, 4.4, 11% w/w). Analysis of biomass production revealed a significant biochar × N fertiliser interaction. In particular, increasing biochar concentrations improved biomass production in both crop species at lower N application rates. The highest biochar application rate resulted in significantly greater accumulation of NO₃⁻-N in the soil and lower NH₄ ⁺-N averaged across the 5 N application rates. The biochar also decreased available P, and significantly increased microbial activity measured using the fluorescein diacetate method. Increasing N fertiliser application resulted in greater accumulation of NO₃⁻-N with no changes to NH₄ ⁺-N averaged across the 5 biochar application rates. Nitrogen fertiliser application did not influence microbial activity or biomass C. The trial suggests that in some cropping systems, biochar application will enable reduced N fertiliser input while maintaining productivity.
Publication Type: Journal Article
Source of Publication: Australian Journal of Soil Research, 48(7), p. 569-576
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1838-675X
0004-9573
Field of Research (FOR): 050304 Soil Chemistry (excl Carbon Sequestration Science)
050301 Carbon Sequestration Science
Socio-Economic Outcome Codes: 961402 Farmland, Arable Cropland and Permanent Cropland Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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