164 EXPERIMENT STATION. [Jan. 



The higher percentage of nitrogen due to the summer top- 

 dressing with nitrate of soda is very noticeable, as was the 

 smaller average weight of roots, compared with the spring 

 application. 



The roots of 1911 gathered in the snmmer just before the 

 annnal snmmer top-dressing showed the same general diiferences 

 between the spring top-dressing and summer top-dressing. 



Spring Application. . 



Plot Number. Per Cent. 



31, 1.81 



34, 2.05 



Average, 1.93 



Summer Application. 



Plot Number. Per Cent. 



32, 2.06 



35, 2.15 



Average, . ,2.10 



Whatever exhaustion of material occurred during the cutting 

 season did not influence the percentages of nitrogen in the roots. 



Effect of Fertilizkrs on the Non-nitrooenous Material 

 OF Asparagus Roots. 

 Wichers and Tollens ^ have shown the proximate composition 

 of asparagus roots and crowns to be as follows : — 



» Loc. oil., p. 109. 



