In a study of nutrient requirements of American ginseng (Panax quinquefolium L.) foliar deficiency symptoms of Ca occurred first, followed by those for Mg and P. N-deficiency symptoms occurred very gradually, and S-deficiency symptoms never appeared. Root fresh weight gain was most restricted by omission of either Ca, P, or Mg from the nutrient solution. Omission of S resulted in a root fresh weight gain equal to that obtained with complete nutrient solution.
Received for publication June 4, 1981. The investigation reported in this paper 81-10-92 is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.
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I thank R. L. Anderson, Assistant to the Dean for Statistical Services (University of Kentucky) for statistical analysis of the data.