428 INVESTIGATION 'BY CULTURE EXPERIMENTS 



TABLE 79. PENNSYLVANIA EXPERIMENTS: FOUR- YEAR ROTATION 

 Records per Acre for Three Complete Rotations, 1885 to 1896 



With every crop there has been a decrease in yield, varying from 

 bushel of wheat, or 4 per cent of the crop, to 14 bushels of corn, 

 or 33 per cent of that crop. The average yearly value of produce 

 from one acre has decreased from $11.05 to $8.18; and this $2.87 

 represents the total decrease, not for a 24-year period, but for a 



