TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 



19 



Table VII. — Annual and average yields of winter wheat on cultivated and uncul- 

 tivated/allow at the Nephi substation, for the years 1910 to 1913, inclusive. 





Treatment. 



Yield per acre of grain (bushels). 





1910 



1911 



1912 



1913 



Average. 



Fallow cultivated 



13 

 14 



29 

 18 



21 

 15 



5 

 5 



17 





13 







Cultivation of Spring-Plowed Fallow. 



In the spring of 1912 tests similar to the ones last discussed were 

 begun on spring-plowed fallow. Both plats produced winter wheat 



/909 



/9/2 



AVE/adGF 



Fig. 9.— Graphs showing the average percentage of moisture in the first 6 feet of soil at the beginning, 

 in the middle, and at the end of the fallow season, as found in the summer-cultivation tests of fail- 

 plowed fallow at the Nephi substation, 1909 to 1912, inclusive. 



in 191 1 and were left in stubble during the winter. They were plowed 

 uniformly as soon as possible the next spring. One was then culti- 

 vated normally during the summer of 1912, while the other was not 

 cultivated. There were practically no weeds or volunteer grain on 



