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3418. Jordan, J.V. and G.O. Baker. 1959. Sulfur uptake and residual studies in northern Idaho using radiosulfur.. ID Agr. Expt. Sta. Research Bull. #42.
Compared plant uptake of S from gypsum, ammonium sulfate, ferrous sulfate, elemental S and green manure peas. Better utilization from gypsum than from elemental S. Green manure was as effective as inorganic sources. S fertilizer increased protein content of alfalfa and peas.