Clay and biochar amendments decreased inorganic but not dissolved organic nitrogen leaching in soil
Daniel N. Dempster A C , Davey L. Jones B and Daniel V. Murphy AA Soil Biology Group, School of Earth and Environment, UWA Institute of Agriculture, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
B Environment Centre Wales, Bangor University, Gwynedd LL57 2UW, UK.
C Corresponding author. Email: dempster.dn@gmail.com
Soil Research 50(3) 216-221 https://doi.org/10.1071/SR11316
Submitted: 29 November 2011 Accepted: 29 March 2012 Published: 25 May 2012
Abstract
Nitrogen (N) leaching from coarse-textured soils frequently leads to productivity losses and negative environmental consequences. Historically, clay amendment has been used on coarse-textured soils to decrease water repellence and nutrient leaching. More recently, biochar has been proposed as an alternative soil amendment to decrease N leaching while simultaneously storing carbon. As biochar has a greater nutrient-retention capacity, we hypothesised that biochar derived from Eucalyptus marginata would be a more effective amendment than clay at minimising N leaching. The soil used was a coarse-textured agricultural sand with the following treatments: (1) biochar incorporated homogenously into the 0–10 cm soil layer, (2) clay incorporated similarly, (3) biochar added as a layer at 10 cm depth, (4) clay added similarly, or (5) a control. Amendments were added at 25 t/ha and watered periodically over 21 days and watered with the equivalent to 30 mm. Clay and biochar amendments significantly decreased cumulative NH4+ leaching by ~20% and NO3– leaching by 25%. Biochar decreased NO3– leaching significantly more than clay, possibly due to decreased nitrification. Dissolved organic N leaching was not influenced by any treatment. Leaching of N was unaffected by amendment application method. We conclude that to decrease N leaching, land managers should apply the most readily available of the amendments in the most convenient manner.
Additional keywords: black carbon, charcoal, dissolved organic nitrogen, DON, mineralisation.
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