Response of Nodulated and Nonnodulated Soybean Seedlings to Sulfur Nutrition
1970
Wooding, F. J. (Frank J.) | Paulsen, Gary M. | Murphy, Larry S.
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.
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