Misconceptions and practical problems in the use of 15N soil enrichment techniques for estimating N2 fixation

The 15N methods are potentially accurate for measuring N2 fixation in plants. The only problem with those methods is, how to ensure that the 15N/14N ratio in the plant accurately reflects the integrated 15N/14N ratio (R) in soil which is variable in time and with soil depth. However, the consequences of using an inappropriate reference plant vary with the… (More)

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