1922] WOODARD—SOIL FERTILITY 89 
sulphur containing substances were added to the non-sulphur 
containing nitrogenous fertilizers, they produced yields equal to 
those from ammonium sulphate. 
SHEDD (63) grew soy beans, oats, alfalfa, and wheat in pots 
containing Kentucky soils. Eight different soils were used, and 
flowers of sulphur added at the rate of too and 200 pounds per 
acre. Both controls and sulphur treated pots received tricalcium 
phosphate, potassium nitrate, and calcium carbonate. There were 
some increases but also some decreases. 
EATON (19) grew sweet corn in pots containing sand. He 
compared the effect of gypsum, flowers of sulphur, and sodium 
sulphate. The controls as well as the different sulphur treatments 
were watered with a nutrient solution which contained no sulphur. 
Gypsum increased the yield, while flowers of sulphur and sodium 
sulphate gave increases for the smaller applications and decreases 
for the larger applications. 
Dutey (17) reported a darker green in sweet clover and corn 
when fertilized with gypsum or sulphur. More nodules were also 
produced on the roots. 
Pitz (57) grew clover in agar-agar containing dipotassium 
phosphate with and without calcium sulphate. Greater length of 
roots was obtained with the calcium sulphate. Clover was also 
grown in Miami silt loam with and without calcium sulphate. 
The calcium sulphate increased the root length. 
Hart and Torrincuam (29) found a decided increase in develop- 
ment of beans, red clover, and peas when fertilized with either 
calcium sulphate or sodium sulphate. In beans and peas the 
increase was in the seed, in clover it was in the hay and roots. 
Sulphates increased the yields of both tops and roots in radishes. 
The yield of rape tops was increased by both calcium and sodium 
sulphates. Barley was not affected by the sulphates, and oats to 
only a slight extent. 
OLson (54) conducted field experiments with alfalfa at the 
Washington Agricultural Experiment Station and obtained in- 
creased yields from the use of acid phosphate and gypsum, but 
not from other forms of phosphorus. Two hundred pounds of 
Sypsum per acre increased the yields of alfalfa from roo to 500 
per cent. 
