I 



60 



The Ottawa Naturalist. 



[July 



Similarly, it was found in 1897 that the weight of clover, 

 leaves and stems, together with roots to a depth ot nine inches, 

 per acre, determined at the close of the season, varied from five 

 tons to ten tons, according to variety and thickness of seeding-, &c. 



To find out what value this system might have in locations 

 where clover would not live through the winter, we ascertained the 

 amounts of fertilizing constituents found in the clover residues 

 the following spring after winter killing. Though less than the 

 amounts previously mentioned, the nitrogen is seen to be present 

 in notable quantities. 



