The Influence of Sulfur on the Yield and Composition of Clovers Fertilized with Different Sources of Phosphorus¹

Sulfur and Nitrogen Content of Alfalfa Herbage During Growth1

“…Ib/ growth had disappeared by the full bloom stage of growth in two experiments. An increase in N content in legumes from S fertilization has been reported by several workers (2,6,11) and is attributed to an indirect effect through increased symbiotic nitrogen fixation. An examination of the data of Table 1 reveals that, relative to the amount in the plant, percent S was increased more than fercent N by S fertilization.…”

Sulphur in Nitrogen Metabolism of Legumes and Non-Legumes

“…Sulphates greatly increased symbiotic nitrogen fixation as did molybdenum. Increase in the percentage nitrogen content of various legumes has been observed to result .19 0.25 0.40 O.Sl from the use of sulphur-containing fertilizers on deficient soils (Miller 1919;Reimer and Tartar 1919;Olson and St. John 1921;Neller 1926;Powers 1930;Evans and Greaves 1937;Bledsoe and Blaser 1947). Miller (1919) suggested that the increase in nitrogen content of the legume was due to the sulphates stimulating the action of the legume bacteria.…”

Sulfur Removed from Soils by Field Crops1

“…Data from Lipman and Conybeare (11) show that alfalfa and some of the other legumes remove large amounts of sulfur from the soil. Bledsoe and Blaser ( 2) found that where sources of phosphorus other than ordinary superphosphate were used the addition of gypsum…”