1910.] PUBLIC DOCUMENT — No. 31. 43 



a combination of similar materials in different proportions, 

 and fnrnisbiug less potash and much more phosphoric acid, 

 the crop the past year was hay, mixed timothy, red top and 

 clovers. This experiment was begun in 1891, and for the 

 past fourteen years corn and hay, two years each, have reg- 

 ularly alternated. Owing to the very dry summer the field 

 was cut but once. The average yields were at the following 

 rates per acre : — 



Pounds. 



On the fertilizer combination rich in phosphoric acid 



and relatively poor in potash, ..... 5,094 



On the fertilizer combination richer in i:)otash and 

 poorer in phosphoric acid, ...... 5,320 



The proportion of clover in the plots receiving the combina- 

 tion richer in potash is noticeably greater than on the other 

 plots. The combination richer in potash in these experiments 

 has shown itself substantially equal to the other combination 

 for the production of corn, and superior for the production of 

 hay. 



VIII. The experiments for the production of hay, by using 

 in rotation as top-dressing barnyard manure, wood ashes and 

 a mixture of bone meal and potash, have been continued dur- 

 ing the past year in the nine-acre field where these experi- 

 ments have been under progress since 1893. The average yield 

 on the entire area during the past year was at the rate of 5,036 

 pounds of hay. The yields on the different materials used in 

 top-dressing were at the following rates per acre : — 



Pounds. 



Barnyard manure, ........ 5,394 



Wood ashes, 4,708 



Fine ground bone and potash, 5,160 



The average yields to date nnder the different systems of 

 top-dressing have been at the following rates per acre : — 



Pounds. 



Barnyard manure, G,373 



Wood ashes, 5,805 



Fine ground bone and potash, ..... 6,164 



The average yield of the nine acres, from 1893 to 1909 in- 

 clusive, has been at the rate of 0,150 pounds per acre. The 



