ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 54 Number 3
An improved Nessler method for the determination· of ammonium-nitrogen in extracts of tropical soils
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.