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The determination of mineral nitrogen in soil with particular reference to nitrate / by J. R. Freney and R. Wetselaar.
by Wetselaar, R.; Freney, J. R. (John Raymond);
Year: 1967., Callno: 631.42:631.416.1 FRE
Book
Agriculture and the nitrogen cycle : assessing the impacts of fertilizer use on food production and the environment / edited by Arvin Mosier, J. Keith Syers, and John R. Freney.
by Freney, J. R. (John Raymond); Mosier, Arvin.; International Council for Science. Scientific Committee on Problems of the Environment.; Syers, John K. (John Keith);
Year: c2004., Callno: 631.84 AGR
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