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Response of Nodulated and Nonnodulated Soybean Seedlings to Sulfur Nutrition¹

Sulfur deficiency decreased growth and concentrations of nonsoluble N and soluble protein N, increased concentrations of nonprotein N and free amino acids, and had little effect on nitrate N in soybean seedlings. Amide N concentration increased and nitrate reductase activity decreased only in S-deficient nonnodulated seedlings grown with nitrate N source. Ammonia N concentration increased only in S-deficient nodulated seedlings grown without an available N source. Nodule hemoglobin concentration was affected little, but nodule quantity and total N₂ fixed were decreased markedly by S deficiency. The capacity of soybean seedlings to fix N₂ was less than their ability to utilize nitrate N.

Key Words: N constituents • N₂fixation • Legume hemoglobin • Mineral nutrition

² Graduate Research Assistant and Associate Professors, respectively, Department of Agronomy, Kansas State University, Manhattan 66502.

Received for publication September 8, 1969.