1913.1 



PUBLIC DOCUMENT — No. 31. 



161 



Per Cent. 



Dry matter, 21. 08 



Ash/ 0.56 



Nitrogen, 1.95 



Phosphoric acid (PoOg), 48 



Potash (KoO), 2.3G 



Lime (CaO), 34 



Soda (NasO), 30 



Magnesia (MgO), 17 



Sulfuric acid (SO3), ,56 



An interesting fact showTi by this table is the higher average 

 percentage of sulfuric acid over that of phosj^horic 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 with crops. 



Effect of Nitrate of Soda on Ash Constituents. 



Roots of 1908. 



Effect of Superphosphate on Ash Constituents. 



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. 



