PENNSYLVANIA FIELD EXPERIMENTS 



423 



TABLE 78. PENNSYLVANIA EXPERIMENTS: FOUR -YEAR ROTATION 

 Records per Acre for Six Complete Rotations, 1885 to 1908 



1 Where used, potassium is always applied at the rate of 166 Ib. per acre in 

 potassium chlorid, and phosphorus always at the rate of 42 Ib. per acre in acid 

 bone black except on plots 12 and 35, where ground bone is used. One half of 

 the application is made for corn and the other half for wheat, except the burnt lime, 

 which is all applied for corn. 



In Table 78 are recorded the average results in actual yields of 

 corn, oats, wheat, and hay, for the 24 years, 1885 to 1908. In order 



