Fertilizers

Abstract

This review covers articles in the biennium ending August 15, 1958, which the author considers particularly pertinent to the analysis of fertilizers. The last review in this series appeared in April 1957 (11). OFFICIAL METHODSThe biennium saw the Association of Official Agricultural Chemists (AOAC) incorporate rather extensive changes into its methods. It adopted as "first action" a reduced iron method for nitrogen, a differential spectrophotometric method for total phosphorus, and volumetric and flame photometric methods for potassium.