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Trace Elements in Agricultural Limestones of the United States¹

Synopsis: Trace element contents of agricultural limestones vary widely and are highest in samples from the West North Central States. At normal liming rates many limestones contribute significant amounts of certain trace elements and a few limestones contain amounts sufficient for correction of deficiencies. Contamination from overburden and milling equipment causes agricultural limestone to be higher in trace elements than unquarried rock. Contents of several elements are proportional to silicon content or total impurity.

² Chemist and Senior Chemist, respectively, Fertilizer Investigations Research Branch. The authors are indebted to the agricultural limestone producers of the United States and the National Agricultural Limestone Institute for their cooperation and to R. Winkler, J. Margeson, F. Sorensen, D. Thiel, and C. Di Bella, who made many of the determinations.

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