THE DRY FARMING CONGRESS. J 51 



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 Highmore, South Dakota, 1906, 1907 and 1908; each curve repre- 

 senting the year designated on curve, as follows: 

 Column No. 



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



2. Yield of Oats on fall plowed land after Wheat. 



