The Macaulay Institute for Soil Research2 1 The author is indebted to Dr. R. L. Mitchell for the flame photometric analyses of sodium, potassium, and calcium reported here. Messrs. A. Hall and W. Watt were responsible for analyses of iron and phosphorus. Thanks are also due to Dr. Edwin J. Haertl of the Bersworth Chemical Company, Framingham, Massachusetts, for the chelates used in this paper and for continued interest and advice. 2 Craigiebuckler, Aberdeen, Scotland.
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Peder Kock (1955) studied this question.