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. 
4 feet. 
5 feet. 
feet. 
Average. 
CULTIVATED. 
1900: 
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 
August 6 
1911: 
April 26 
September 20 
1912: 
Mavl5 
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 
S.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 
20.48 
14.44 
13.16 
19.84 
14.28 
12.60 
18.23 
14.92 
12.91 
16.79 
15. 83 
14.42 
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 
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 
17.05 
16.46 
13.48 
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, 
