TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 33 



moisture in the 6 feet of soil sampled and that, so far as moisture con- 

 servation is concerned, no advantage was derived from the cultiva- 

 tion of the crop. 



Table XIV. — Annual and average percentages of moisture in each of the first 6 feet of soil 

 on the plats used in the test of spring cultivation of winter wheat at the Nephi substation, 

 samples taken in spring, summer, and fall, for the years 1909 to 1913, inclusive. 



Treatment and date of determi- 

 nation. 



Depth of sampling. 



1 foot. 



2 feet. 



3 feet. 



5 feet. 



6 feet. 



Average. 



CULTIVATED. 



1909: 



June 26 



August 12 



1910: 



May 15 



June 28 



August 6 



1911: 



April 26 



Septembor 20 



1912: 



Mavl5 



June 27 



August 2 



1913: 



May 17 



June 20 



September 6 



Average in spring.. 

 Average in summer 

 Average in fall 



NOT CULTIVATED. 



1909: 



June 26 



August 12 



1910: 



May 15 , 



June 28 



AugustO 



1911; 



April 26 



September 20 



1912: 



Mav 15 



June 27 



August 2 



1913: 



Mav 17 , 



June 20 



September 6 



Average in spring... 

 Average in summer 

 Average in fall 



12.60 

 12.75 



13. 05 

 10.38 

 8.53 



18.28 

 9.12 



20.17 

 9.92 

 9.48 



20.50 

 10.83 

 10.67 



18.00 

 10.93 

 10.11 



13.15 

 10.65 



14.35 

 12.98 

 8.75 



18.79 

 8.91 



16.77 

 12.04 

 10.61 



18.88 

 10.73 

 11.30 



17.20 

 12.23 

 10.04 



16.25 

 15.20 



16.30 

 12.63 

 11.35 



21.90 

 12.13 



21. 51 

 13.11 

 13.65 



22.22 

 15.77 

 13.49 



18.02 

 15.45 



17.33 

 11.33 

 11.10 



20.46 

 11.95 



20.17 

 12.14 

 12.24 



21.38 

 15.63 

 12.24 



18.50 

 18. 95 



17.70 

 11.18 

 11.15 



18.90 

 11.48 



17.99 

 14. 25 

 11.52 



18.32 

 15. 73 

 11.43 



19.25 

 16.70 



18.15 

 13.30 

 13.10 



17.80 

 14.72 



15.21 

 15.23 

 13.99 



15.98 

 15. 54 

 13.58 



17.63 

 12.82 



19.95 

 16.90 

 11.38 



15.65 

 13.42 



17.04 

 16.23 

 17.30 



15.54 

 15. 06 

 12.49 



20.48 

 14.44 

 13.16 



19.84 

 14.28 

 12.60 



18.23 

 14.92 

 12.91 



16.79 

 15.83 

 14.42 



17.05 

 16.46 

 13.48 



16.15 

 12.90 



17.65 

 11.83 

 11.88 



22.69 

 13.39 



21.35 

 14.15 

 13.69 



20. 59 

 15.80 

 12.88 



17.20 

 12.20 



18.95 

 11.78 

 11.65 



21.79 



13.08 



20.21 

 14.05 

 12.62 



20.20 

 17.21 

 12.29 



17.28 

 10.15 



18.20 

 11.05 

 11.75 



19.60 

 12. 51 



20.22 

 .18.00 

 12.67 



19.10 

 15.91 

 12.05 



16.85 

 11.05 



18.35 

 13.20 

 13.10 



19.07 

 15.13 



19.21 

 16.17 

 14.78 



17.12 

 16.23 

 15. 18 



15.22 

 13.45 



19.45 

 17.95 

 17.85 



17.78 

 13.25 



17.20 

 15.99 

 16.72 



19.04 

 16. 95 

 13.83 



20.57 

 14.48 

 12.95 



20.29 

 15.06 

 12.37 



19.28 

 15.56 

 11.83 



18.44 

 15. 61 

 13. 85 



18.37 

 16. 53 

 15.02 



17.04 

 15.31 



17.08 

 12.62 

 11.10 



18. 83 

 12.14 



18.68 

 13.48 

 13.03 



18.99 

 14. 76 

 12.32 



18.40 

 14.72 

 12.78 



15.97 

 11.73 



17.82 

 13.13 

 12.50 



19.95 

 12.71 



19.16 



15.07 

 13.52 



19.16 



15.47 

 12.92 



19.02 

 14.91 

 12.68 



EFFECT OF CULTIVATION ON THE PLANTS. 



As already stated, the spring cultivation of winter wheat was ex- 

 pected to allow the plants greater freedom for development. It is 

 not known to what extent this result obtained, but it is reasonable to 

 believe that the surface of the soil was placed in better condition for 

 plant development than where the crust was left unbroken and the 

 plants compelled to push through it. It is, however, almost impos- 

 sible to break the crust without injuring some plants. Whether this 

 injury is offset by the benefit to others is difficult to determine, 



