Abstract
Tobacco plants grown in quartz sand culture at low SO/sub 4/ exhibited characteristic sulfur deficiency symptoms. Statistical analysis of average leaf length revealed highly significant reductions in size due to the low SO/sub 4/. Average length and weight of leaves decreased as SO/sub 4/ levels were increased beyond 96 ppm. Plants grown at low SO/sub 4/ exhibited no marked growth responses but increases in Cl to 280 ppm caused moderate increases in average length and weight of leaf. Inhibitive effects of high Cl on leaf burn were clearly demonstrated while effects of high SO/sub 4/ were not as marked. Chlorine percentage in the leaf was increased to a greater extent that sulfate sulfur by additions of the respective ion to the substrate. Abnormalities in the stem structure were found with low SO/sub 4/. Increased leaf thickness was found at higher concentrations of the Cl and SO/sub 4/ ion. Variations in burn of tobacco leaves could not be explained on the basis of anatomical structure. 21 references, 12 figures, 2 tables.
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