Simplification of the standard method for determination of non‐exchangeable NH 4 −N in soil | Zendy

Zhang Yangsong | Zendy; Scherer Heinrich W. | Zendy

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Simplification of the standard method for determination of non‐exchangeable NH 4 −N in soil

Author(s) -

Zhang Yangsong,

Scherer Heinrich W.

Publication year - 1998

Publication title -

zeitschrift für pflanzenernährung und bodenkunde

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.644

H-Index - 87

eISSN - 1522-2624

pISSN - 0044-3263

DOI - 10.1002/jpln.1998.3581610203

Subject(s) - boiling , centrifuge , reagent , microwave oven , reproducibility , soil water , chemistry , microwave , soil test , analytical chemistry (journal) , chromatography , environmental science , soil science , organic chemistry , physics , nuclear physics , quantum mechanics

The widely‐used Silva‐Bremner method for determining non‐ exchangeable NH 4 −N in the soil was modified so as to reduce reagent requirement and the time taken to carry out the analyses. In the modification, boiling the mixture of soil and KOBr on a hot plate was replaced with heating the soil/KOBr mixture, directly placed in centrifuge tubes, in a boiling water bath or a microwave oven. The best procedure is to keep the soil/KOBr mixture for 10 minutes in the water bath or for 10 minutes at 50% of full power in a microwave oven. The modified method gave similar values to the standard method on 4 quite different soils and also slightly increased reproducibility.

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