Missouri Corn Growers' Association. 



343 



half tons of yard manure per acre annually has increased the 

 yield of corn 12.21 bushels, while the increase from five tons of 

 manure under similar circumstances has been 22.51 bushels, 

 with corresponding increases in the stover. The value of these 

 increases has been $5.70 and $10.39, respectively, or a value of 

 $2.28 per ton of manure for the lighter application and $2.08 

 per ton for the heavier. 



In a rotation the value of manure is even more apparent 

 than when used in connection with a one-crop system. In a 

 five-year rotation of corn, oats, wheat, clover and timothy at 

 the Ohio Experiment Station manure has been applied in one 

 case at the rate of 8 tons per acre before corn and wheat and in 

 another case at the rate of 4 tons before each of these crops. 

 The increase in the yield on each crop is shown in the following 

 table: 



EFFECT OF MANURE ON THE YIELD OF CROPS GROWN IN FIVE- 

 YEAR ROTATION OF CORN, OATS, WHEAT, 

 CLOVER AND TIMOTHY. 



OHIO EXPERIMENT STATION. 



Manure applied before corn and 

 wheat in the rotation. 



8 tons per acre . 

 4 tons per acre. 



Average annual increase per acre for 19 years. 



Corn, 

 bushels. 



22.96 

 14.11 



Oats, 

 bushels. 



12.14 

 7.40 



Wheat, 

 bushels. 



11.77 

 7.66 



Clover, 

 pounds. 



2,065 

 2,167 



Timothy, 

 pounds. 



1,504 

 980 



The value of the manure is best illustrated in the following 

 table, which summarizes the value of the increase in each crop: 



AVERAGE VALUE OF TOTAL INCREASE PER ACRE FOR EACH ROUND 



OF THE ROTATION.* 



* Ohio Experiment Station, Circular 131, 1913. 



