POTASH AND SULFUR FERTILIZERS 



183 



Table 37. — Pounds op Sulfur Trioxide and Phosphoric Acid 

 Removed from an Acre of Soil by Average Crops 



Content in Pounds to the 

 Acre 



Crop and Yield to the Acre 



Wheat (30 bu.) 



Barley (40 bu.) 



Oats (45 bu.) 



Corn (30 bu.) 



Alfalfa (9000 lb. dry wt.) 

 Turnips (4657 lb. dry wt.) . 

 Cabbage (4800 lb. dry wt.) . 

 Potatoes (3360 lb. dry wt.) . 

 Meadow hay (2822 lb. dry wt.) 



21.1 

 20.7 

 19.7 

 18.0 

 39.9 

 33.1 

 61.0 

 21.5 

 12.3 



238. Quantities of sulfur in soils. — Analyses of. virgin 

 and cultivated soils have shown that there has been a de- 

 pletion of sulfur in cropped soils. It also appears that the 

 quantity of sulfur trioxide is probably not greater than the 

 quantity of phosphoric acid in many soils, as may be seen 

 from the following table, which is based on the analyses of a 

 considerable number of soils. 



Table 38. — Pounds of Sulfur Trioxide and Phosphoric Acid 

 in Sandy and Clay Soils 



239. Quantities of sulfur in drainage water. — Sulfur 

 suffers a much greater removal in drainage water than does 

 phosphoric acid. In lysimeter experiments this has been 



