CROP ROTATION 



19 



since the more heavily fertilized crops under continuous 

 culture give lower yields. Nitrogen, phosphorus, and 

 potassium to the amounts indicated in the table are applied 

 in the form of nitrate of soda, dried blood, acid phosphate, 

 and muriate of potash. In the rotation system the amount 

 indicated is applied only once in five years and is divided 



Ohio Experiment Fields, Woostbe 



Experiments in progress 18 years, 1894^1911. Rotation of corn, 

 oats, wheat, hay, hay, compared with continuous culture 



between the corn and wheat. In the single crop system 

 the application shown is applied every year. The com- 

 parative yields for the last five years are as follows, the 

 larger being always for the rotation system : corn, 45 and 

 35 bushels per acre, oats, 48 and 24 bushels, and wheat, 

 28 and 22 bushels. Comparing the rotation plots receiv- 



