ox EXPERIMENTS ON MANURES. 85 



bushels per acre, applied in the spring, and was not har- 

 rowed. Gave 18 quarts of rye, or 9 bushels per acre, 

 by measure. The weight was 33^ pounds. 



No. 2. Containing 10^ square rods. Was harrowed 

 in April, but had no manure at any time. Gave 15 

 quarts, or 7 bushels 8 quarts per acre, by measure. 

 Weight 29^ pounds. 



No. 3. Containing 13| rods. Had bone in Septem- 

 ber ; 16 bushels per acre ; was harrowed in April ; gave 

 52 quarts, or 19 bushels 12 quarts per acre, by measure. 

 Weight 98 pounds. 



No. 4. Containing 13| rods. Had bone in Septem- 

 ber, 9 bushels per acre, and was harrowed in April. 

 Gave 39 quarts, or 14 bushels 17 quarts per acre, by 

 measure. Weight 73-i- pounds. 



No. 5. Containing 8^ rods. Boned in September, 9 

 bushels per acre. Not harrowed in April. Gave 27^ 

 quarts, or 15 bushels 23 quarts per acre, by measure. 

 Weight 51^ pounds. 



These several lots give an average weight of the 

 grain per bushel, of G0| pounds, nearly. 



The results arrived at by this trial are— 



1st. That harrowing in the spring reduced the crop 

 from 15 bushels and 23 quarts, to 14 bushels and 17 

 quarts ; i. e. caused a loss of 1 bushel and 6 quarts per 

 acre. 



2d. 9 bushels of bone gave an increase of 7 bushels 

 and 9 quarts of rye per acre. 



3d. 16 bushels of bone gave an increase of 12 bushels 

 and 4 quarts per acre. 



4th. The application of bone (9 bushels) in the spring 

 seems to have given an increase of 1 bushel and 24 

 quarts per acre; but this ground was not harrowed in 

 the spring, and it may be but fair to ascribe one half the 

 gain to this cause. 



The above trial was as fair as is often made. The 

 soil of lots 1 and 2 was a little lower and a little 

 stronger than that of the others. This caused it to suf- 

 fer more in the winter from the frosts, but gave it an ad- 

 vantage in the summer. 



