496 
Journal of Agricultural Research 
Vol. XIV, No. ix 
average ratio for all crops is 85. This station shows the clearest cut and 
most decisive results of any station where subsoiling has been investigated. 
Table VIII.— Yields at the Akron (Colo.) Field Station of spring wheat, winter wheat , 
oats, barley , and corn each year from igog to igi6 , inclusive , on plot E, subsoiled , and 
plot B, not subsoiled but otherwise similarly treated , together with the average of each 
method for the entire period of years; the ratio of the yield on E to the mean of the yield 
on B and E each year; the mean ratio; and the probable error of the mean ratio 
[Yields of all crops in bushels per acre] 
Yield or ratio. 
Crop and plot. 
1909 
1910 
19x1 
191a 
1913 
19x4 
1915 
1916 
Aver¬ 
age. 
Prob¬ 
able 
error of 
mean 
ratio. 
Spring wheat: 
Plot B. 
Plot E. 
Ratio of E 
to mean.. 
10.3 
11. 2 
T04 
6 . 2 
5*5 
94 
4.1 
i *5 
54 
20. 7 
16.0 
87 
0. 8 
*5 
77 
12. 2 
9. 8 
89 
25.8 
23-7 
96 
3*8 
i *7 
62 
10-S 
8.7 
83 
± 4-4 
Winter wheat: 
Plot B. 
10. 7 
6. 8 
26. 7 
2. 0 
24. 8 
20, 8 
4 . 2 
Ti *7 
Plot E. 
6. 0 
3*3 
21. 2 
7. 2 
24.5 
21. O 
T * 
7 . 8 
x O* / 
12. O 
Ratio of E 
V. y 
0* * 
to mean.. 
80 
89 
123 
99 
IOO 
95 
93 
± 4 * 4 
Oats: 
Plot B. 
14.1 
8. 0 
15*9 
46.9 
.6 
36.9 
57 - 2 
7.2 
23*4 
Plot E. 
16.1 
11. 3 
8.4 
35-3 
0. 0 
3 °* 3 
57*5 
4.1 
20. 4 
Ratio of E 
to mean.. 
107 
117 
69 
86 
0. 0 
90 
100 
73 
80 
± 7-9 
Barley: 
Plot B. 
16. 8 
io- 5 
16. 3 
27.9 
3 * 1 
36.7 
47*9 
5 *o 
20. 5 
Plot E. 
19. 8 
6.9 
5 * 2 
22. 5 
i* 5 
27.9 
5 2 * 3 
4.2 
i 7 * 5 
Ratio of E 
to mean.. 
108 
79 
48 
89 
65 
86 
104 
9 i 
84 
± 4 - 7 
Com: 
Plot B. 
27 -3 
18.3 
0. 0 
46.9 
9.9 
17*3 
29. 2 
4-8 
19. 2 
Plot E. 
32. 8 
12. 7 
0. 0 
37 - 1 
4-3 
13*9 
22. 3 
3 * 2 
15.8 
Ratio of E 
to mean.. 
109 
82 
88 
61 
89 
87 
80 
85 
± 3 * 2 
HAYS FIELD STATION 
The soil of the field station on which the experimental work has been 
conducted at Hays, Kans., is a heavy silt loam. Penetration of water 
to the lower depths is slow, the very compact soil in the third foot offer¬ 
ing marked resistance to its downward passage. 
Table IX presents from this station a record beginning with 1907 for 
winter wheat and com; 1908 for spring wheat, oats, and barley; 1911 
for kafir; and 1912 for milo. In the average of all the years the higher 
yields are from the subsoiled plots with all crops except barley, which 
shows no difference. With com the higher yield has been obtained 
