THE DRY FARMING CONGRESS. 



149 



The upper half of this diagram shows by curves and figures the average 

 yields in bushels, of Oats raised under different systems of rotation and soil 

 preparation at Edgeley, North Dakota, in 1907 and 1908; each curve represent- 

 ing the year designated on curve, as follows: 

 Column No. 



1. Yield of Oats on spring plowed land after Wheat. 



