232 THE FARMER OF TO-MORROW 



grains, there are 25 parts per million of potash 

 and 10 parts of phosphoric acid. The results 

 he obtained did not vary, even though one 

 sample was found to contain 30,000 parts of 

 potash reserve, and another 120,000; and one 

 soil contained 5,000 parts phosphoric acid re- 



CHART SHOWING PHOSPHATES RECOVERED FROM SOILS IN EIGHT STATES- 



From Bulletin 26, Bureau of Soilt, Prof. F. H. King. 



serve and the second 20,000. These results are 

 again almost identical with experiments con- 

 ducted under actual field conditions in eight 

 states by the late Professor F. H. King of 

 Wisconsin. In a single leaching by distilled 

 water he recovered from 3 to 9 parts per 

 million of phosphates. ( Investigations in Soil 

 Management, Bulletin 26, Bureau of Soils, 

 p. 51.) 



