Sulfur Needs of Spanish Clover and the Relation of Sulfur to Other Nutrients as Diagnosed by Plant Analysis

Abstract

Sulfur needs of Spanish clover, Lotus purshianus (Benth.) Clements and Clements, were determined by plant analysis in a nutrient solution study. Top growth was affected more than root growth by changes in S supply. Protein synthesis in the shoots was affected little by S deficiency. Sulfate-S was better than organic-S or total-S to diagnose the S status of the plant adequately. The critical sulfate-S concentration for growth of the plant is about 100 ppm, dry basis, in the middle stem section of the shoots.