Lela V. Barton, Sam F. Trelease, Stimulation, Toxicity, and Antagonism of Calcium Nitrate and Manganese Chloride as Indicated by Growth of Wheat Roots, Bulletin of the Torrey Botanical Club, Vol. 54, No. 7 (Oct., 1927), pp. 559-577
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Barton et al. (1927) studied this question.