THE DRY FARMING CONGRESS. 



153 



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 

 pi eparation at North Platte, Nebraska, 1907 and 1908; each curve representing 

 the year designated on curve, as follows: 

 Coliimri No. 



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



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



