TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 27 



The climatic and soil conditions under which these results were 



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FiG; 15.— Diagrams showing the precipitation at seeding time in the fall and curves showing the annual 

 yields of two varieties of winter wheat used in the time-of-seeding tests at the Nephi substation, 

 1909 to 1913, inclusive. 



obtained present problems of a different nature than those so far 



