Abstract
GREATLY increased use of fertilizer nitrogen has stimulated interest in the development of more precise methods of measuring the nitrogen supplying-power of soils and estimating fertilizer nitrogen requirements. At present, four approaches are used for this purpose: (1) microbiological methods1 in which nitrogen mineralized during a prescribed period of incubation, usually of 1–2 weeks' duration, is measured; (2) total nitrogen; (3) mineral nitrogen content of fresh2 samples; and (4) nitrogen mineralized as a result of chemical treatment involving acid3,4 or alkaline hydrolysis5.
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MACLEAN, A. Measurement of Nitrogen Supplying-power of Soils by Extraction with Sodium Bicarbonate. Nature 203, 1307–1308 (1964). https://doi.org/10.1038/2031307a0
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DOI: https://doi.org/10.1038/2031307a0
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