1910.] PUBLIC DOCUMENT — No. 31. 43 



a c'()iiil)ina(it)n of isiinilar materials in different proportions, 

 and furnishing 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 1801, and for the 

 ])ast 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 : — 



PoiinJs. 



On the fertilizer eoml)ination rioli in phosphoric acid 



and relatively poor in i)otash, ..... 5,094 



On tlie fertilizer coniljinatiou richer in potash and 



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



The proportion of clover in the plots receiving the combina- 

 tion richer in pDtash is noticeably greater than on the other 

 ]»k)ts. The cond)ination 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 nsing 

 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 mannre 5,394 



Wood ashes . 4,708 



Fine g-round bone and potash, ..... 5,160 



The average yields to date under the diiferent systems of 

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



Pounds. 



Barnyard manure, 6,373 



Wood ashes, 5,805 



Fine ground bone and potash 6,164 



The average yield of the nine acres, from 1803 to 1000 in- 

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



