1913. 



PUBLIC DOCUMENT — No. 31. 



159 



of either in the top-dressing produces a notably lower average 

 weight of roots. The medium applications of phosphate and of 

 potash salts produce the highest average weights of roots. 



Ttousseaux and Brioux ^ found the heaviest roots where 

 manure and chemicals were combined, and it is of interest that 

 the fresh weight was 2,600 grams, which is practically the same 

 as the weight of our roots from the plots receiving top-dressings 

 of medium amounts of fertilizers. 



Effect of Season of Amplication of Nitrate of Soda on Weight of Roots. 



Spring Application {Grams). 



Spring and Summer Applications (Grams). 



Low, 



Medium, . 

 High, 



Average, 



The summer top-dressing with nitrate has produced smaller 

 mature roots than the spring top-dressing, in both years 1008 

 and 1910. On the other hand, the roots of 1911, taken at the 

 end of the cutting season in the summer, show variable results, 

 with, the average weight heavier on the summer-dressed, plots. 



1 Loc. ciL, p. 312. 



