Unexhausted Residue of Manures. 



33 



than that of plot 5. In the next year the difference was 

 only 4 bushels in favour of plot 16. In each of the two 

 next years plot 16 yielded 5 bushels in excess of plot 5. 

 In the fifth year (1869) the total produce on plot 16, grain 

 and straw, was only 1041b. more, and in the sixth year it 

 was even 71b. per acre less than on plot 5. During the next 



TABLE III. 



six years, however, the total produce of plot 16 exceeded 

 that of plot 5 in amounts varying from 1091b. to 2211b. 

 After 1876, the table shows that, with one exception, the 

 yield on plot 16 was less than that on plot 5. It was, there- 

 fore, not until twelve years after the last application that all 

 influence due to the previous manuring ceased. 



