1913. 



rUBLIC DOCUMENT — No. 31. 



161 



An interesting fact shown by this table is the higher average 

 percentage of sulfuric acid over that of phosphoric acid. The 

 proportions of fertilizing constituents were varied somewhat by 

 the applications of different quantities of the chemical fertilizers, 

 as is usually observable in similar experiments witJi crops. 



Effect of Nitrate of Soda on Ash Constituents. 



Roots of 1008. 



Effect of Superphosphate on Ash Coyistituents. 



Roots of 1910. 



• Ash determinations and all ash analyses were made in the fertilizer section by Mr. H. D. 

 Haskins and Mr. L. S. Walker. 



