eee 
1922] EATON—SULPHUR CONTENT OF SOILS 33 
ROBINSON and co-workers (22, 23) have analyzed a number of 
soils from different parts of the United States. The sulphur 
content is not high, the average for thirty-five important agri- 
cultural soils being 0.052 per cent, with a range of 0.012-0.156 
per cent. SHEDD (24) finds the soils of Kentucky much poorer 
in sulphur than in phosphorus, and is inclined to place sulphur 
in the same class with phosphorus, potassium, and nitrogen as 
one of the chief limiting factors in crop production. In pot 
experiments with some of these soils, tobacco, soy beans, turnips, 
radishes, mustard, and alfalfa were benefited by sulphur fertiliza- 
tion. Ames and Bortz (1) report analyses for certain Ohio soils. 
The unfertilized soils range in sulphur content from 0.020 to as 
high as 0.055 per cent. Brown and Kettoce (2) find nearly 
twice as much sulphur as phosphorus in some of the larger soil areas 
of Iowa. The Mississippi loess proves to be lowest, the soil samples 
in this area ranging in sulphur content from 441 to 847 pounds 
per two million pounds of soil. Swanson and MILLER (27) have 
analyzed a number of the soils of Kansas and find that the culti- 
vated soils analyzed have an average sulphur content of 0.027 
per cent. Certain cultivated soils of Wisconsin, analyzed by 
Hart and Peterson (8), prove to be low in sulphur, the average 
being 0.020 per cent. They summarize the results of their analyses 
of a number of crops by stating that cereal crops remove from the 
soil about two-thirds as much sulphur trioxide as phosphorus pen- 
toxide, the grasses of mixed hay as much sulphur as phosphorus, 
while the legume hays may take from the soil about as much sulphur 
as phosphorus, or, as in the case of alfalfa, more sulphur than 
Phosphorus. Such crops as the cabbage and the turnip may 
remove two to three times as much sulphur trioxide as phosphorus 
pentoxide. RerMeR and Tartar (21) give analyses for a number 
of Oregon soils. The range in the sulphur content of the surface 
Soils is o.015-0.038 per cent. The phosphorus content is much 
greater. The sulphur fertilization of alfalfa grown on these soils 
Produces greatly increased yields. Increased tonnage yields of 
50-1000 per cent are secured, and the protein content is increased 
in some cases almost 2 percent. In experiments in Washington by 
