Availability of the residual nitrogen from a single application of 15N-labelled fertilizer to subsequent crops in a long-term continuous barley experiment |
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Authors: | Glendining MJ Poulton PR Powlson DS Macdonald AJ Jenkinson DS |
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Institution: | (1) Soil Science Department, IACR-Rothamsted, Harpenden, Herts, AL5 2JQ, UK |
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Abstract: | In an earlier paper we presented data from an experiment in which nitrogen-15-labelled fertilizer was applied in spring to barley on the Rothamsted long-term Spring Barley Experiment, at rates of 48, 96 or 144 kg N ha–1. A substantial proportion (between 28 and 39%) of this 15N remained in the soil (0–70 cm) and stubble at harvest, mostly in organic form. The present paper follows the fate of this `residual' 15N over the following 2 years. Small amounts of `residual' 15N were recovered in the following two spring barley crops; 8% in the first and 3% in the second. The overall loss of `residual' 15N (i.e. `residual' 15N not recovered in crops and soil to a depth of 70 cm) over the 2 years was 23%. This is equivalent to just 8% of the total 15N originally applied. There was surprisingly little difference in the behaviour of the `residual' 15N in soils containing very different quantities of soil organic matter. |
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Keywords: | crop residues 15N-labelled fertilizer residual 15N soil organic matter spring barley |
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