An improved Nessler method for the determination· of ammonium-nitrogen in extracts of tropical soils

C.T.I. Odu

Abstract


The ammonium-nitrogen contents of some tropical soil were determined by four different methods one of which was a modification of the Nessler method to include calcium, magnesium and potassium both in the oil extracts and standards with a view to correcting interference by these cations. Addition of these cations resulted in more accurate figures for ammonium-nitrogen.

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