Soil warming and liming impacts on the recovery of 15N in an acidic soil under soybean cropping |
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| Authors: | Waqar Ahmad Feike A Dijkstra Ram C Dalal Balwant Singh |
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| Institution: | 1. Department of Environmental Sciences, Faculty of Agriculture and Environment, The University of Sydney, Eveleigh, NSW 2015, Australia;2. Food and Agriculture Organization of the United Nations, NARC Premises, Park Road, Islamabad, Pakistan;3. Department of Science, Information Technology and Innovation, 41 Boggo Road, Dutton Park, Qld 4102, Australia;4. School of Agriculture and Food Sciences, University of Queensland, St Lucia Qld 4072, Australia |
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| Abstract: | Liming has important implications for N dynamics in acidic soils planted with legumes that are not fully understood. We used a 15N tracer (K15NO3) to examine N dynamics in a Chromic Luvisol planted with soybean with and without lime in environmentally‐controlled chambers set at 20°C and 30°C (full factorial design). Liming increased total N and 15N recovery in soybean, but had no effect on microbial recovery. Elevated temperature, increased total plant N, decreased 15N recovery in soybean and microbes, and increased loss of N through leaching. Our results show enhanced uptake of soil mineral N by soybean with liming, thereby reducing N loss from soil, while an increase in temperature from 20°C to 30°C may enhance N loss in these systems. |
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| Keywords: | 15N tracer liming soybean organic and inorganic N dynamics temperature acidic soil |
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