Influence of Sulphur Deficiency on the Metabolism of the Soy Bean

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Abstract
The plants were grown in sand in a greenhouse. The main symptoms of S deficiency were yellow-green color of leaves, smaller leaves, and thinner stems. The size of the tops was affected more than that of the roots. The stems of the minus-S plants elongated remarkably and were almost as tall as the stems of the plus-S plants. The S-dencient plants were higher in starch, hemicelluloses, nitrates and soluble organic N than the plus-S plants. The latter, however, were higher in sugars. Low reducase content probably accounted for the accumulation of starch, hemicelluloses and nitrates in the minus-S plants, while proteolysis was at least partly responsible for the high content of these plants in soluble organic N.