Premium
Response of Nodulated and Nonnodulated Soybean Seedlings to Sulfur Nutrition 1
Author(s) -
Wooding Frank J.,
Paulsen Gary M.,
Murphy Larry S.
Publication year - 1970
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1970.00021962006200020030x
Subject(s) - nitrate reductase , nitrate , sulfur , ammonia , chemistry , hemoglobin , agronomy , biology , biochemistry , organic chemistry
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 N 2 fixed were decreased markedly by S deficiency. The capacity of soybean seedlings to fix N 2 was less than their ability to utilize nitrate N.