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This term was first used by Purvis and Leo4 (1961). This includes N hydrolysed from soil organic matter and small amounts of exchangeable ammonium that may be present in soil.
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Prasad, R. Determination of potentially available nitrogen in soils — A rapid procedure. Plant Soil 23, 261–264 (1965). https://doi.org/10.1007/BF01358352
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DOI: https://doi.org/10.1007/BF01358352