22 



HATCH EXPERIMENT STATION. 



[Jan. 



Similar averages for this year are as follows : — 



Nitrate of soda, 

 Dried blood, . 

 Sulfate of ammonia. 

 Barnyard manure, 

 No nitrogen, . 



Per Cent. 

 100.00 



94.96 

 91.84 

 71.22 

 62.60 



Combining the results showing relative standing in 1905 

 with similar figures for all the years previous to 1905, the 



relative standing is as follows 



Nitrate of soda, 



Barnjard manure, . 



Dried blood, .... 



Sulfate of ammonia. 



No niti'ogen, .... 



Per Cent. 



100.00 

 94.47 

 91.09 

 88.83 

 71.52 



The figures showing relative standing of the different 

 materials furnishing nitrogen as compared with the no- 

 nitrogen plots so far given are based upon the total yield. 

 If we compare the different materials used as sources of 

 nitrogen on the basis of increase in crop rather than on the 

 basis of total product, they rank to date for the entire period 

 of the experiment, 1890 to 1905, inclusive, as follows : — 



Relative Increases in Yields (Average for the Sixteen Years^. 



Per Cent. 



Nitrate of soda, 100.00 



Barnyard manure, ...... 80.58 



Dried blood, 68.72 



Sulfate of ammonia, ...... 60.78 



Whatever the method of comparison, the superiority of 

 the results obtained from the use of nitrate of soda is very 

 apparent. In estimating the significance of the figures, the 

 fact must not be lost sight of that the four different materials, 

 nitrate, dried l)lood, sulfate of ammonia and barnyard manure, 

 are applied in this experiment in amounts furnishing precisely 

 equal (juantities of nitrogen to each plot where they are used. 

 At current [u-ices, a pound of nitrogen can be purchased at 

 lower cost in nitrate of soda than in almost any other ma- 

 terial ; and the advisability, therefore, of depending largely 

 upon the nitrate as a means of supplying the important 

 element niti'ogeu, becomes strikingly evident. 



