The methods currently available for determining :— Ammoniacal nitrogen Nitrate nitrogen Urea
Organic nitrogen Total nitrogen
in fertilisers are critically discussed. Attention is drawn to substances that interfere with the determinations and recommendations are made as to the best methods to use. Numerous references are included.
A summary of the results of work on the accuracy of the nitrogen determination in the laboratories of member firms of the Fertiliser Manufacturers’ Association is contributed by Dr. I. A. Brownlie (Scottish Agricultural Industries Ltd.).