STUDIES IN THE NUTRITION OF VEGETABLES

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Abstract
May King lettuce grown in sand showed very little response to K over a wide range of conc. Small amts. gave moderately good growth, although a complete absence of potash resulted in a small plant. The ready availability of the K supplied in culture expts. is possibly responsible for the small amt. required as compared with the comparatively large amts. recommended for growth of the plants in soil. Lack of potash first gave a slightly darker leaf than normal, but later tended to cause chlorosis. Scorch appeared with small amts. of potash, even when these were not small enough to cause an appreciable reduction in size. Absence of potash resulted in such rapid, severe scorch and withering away of the older leaves that ultimately a characteristically small, narrow, tall and erect plant resulted; the portions of the leaves between the abnormally wide veins were convex on the upper surface and gave the leaves a characteristic wavy appearance; these areas were at first darker green than normal, but later became chlorotic. Large applications of potash did not induce earlier hearting.

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