488 
Journal of Agricultural Research 
Vol. XIV, No. It 
peculiarly benefited by subsoiling. This is a point not supported by the 
evidence of the io other stations at which barley is grown and therefore 
must be attributed to a soil difference which has been observed and to 
damage by gophers to the B plot in at least two seasons. While this 
damage has been noted in the field, it has not been taken into account 
in the tables. The year of 1913 is the only year in the series when all 
crops yielded as much, or more, on the subsoiled plot as they did on the 
ordinary plowed one. While it is probable that the relation is only a 
coincidence, it is worthy of note that no subsoiling was done in the fall 
of 1912 in preparation for this crop. The average results of all crops, 
including barley, at this station is only 103, with a probable error of 1. 
The conclusion is that subsoiling has been without practical effect. 
Table I.— Yields at the Judith Basin Field Station, Moccasin, Mont., of spring wheat, 
winter wheat, oats, barley, corn, and flax each year from 1910 to 1916, 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 corn are expressed in pounds of stover per acre; of other crops in bushels of grain per acre] 
Crop and plot. 
Yield or ratio. 
Prob¬ 
able 
error 
of 
mean 
ratio. 
1910 
1911 
191a 
1913 
1914 
1915 
1916 
Average. 
Spring wheat: 
Plot B . 
14 . O 
22. 0 
(a) 
18. < 
1 c. 8 
27. O 
2T. T 
TO. 7 
Plot E. 
2 3 - 5 
(0) 
22. 8 
16. c 
*/* v 
2 5-5 
20. O 
20. 6 
Ratio of E to 
j 
mean. 
103 
103 
no 
102 
97 
97 
* 102 
± 1-3 
Winter wheat: 
Plot B. 
24. 0 
27 , c 
12, 2 
27 , 2 
16. 7 
28. C 
0. 0 
18. 2 . 
Plot E. 
23.2 
22. 4 
*2. 5 
26. 2 
* 5-5 
28. 7 
0.0 
18.3 
Ratio of E to 
mean. 
98 
98 
101 
106 
97 
IOO 
IOO 
±0. 9 
Oats: 
Plot B. 
20. 9 
5 i -5 
(°) 
65.O 
49-3 
50. 6 
45.6 
47. 2 
Plot E. 
2 5 - 3 
53 -o 
( a ) 
65. O 
40. 6 
57 -1 
43 - 1 
47-4 
Ratio of E to 
mean. 
no 
101 
IOO 
90 
106 
97 
IOI 
± 1.9 
Barley: 
Plot B. 
12. c 
24. 1 
(0) 
21. O 
18. 1 
24. 0 
20. < 
20. 2 
Plot E.. 
15 - ° 
32. 6 
W 
32.9 
2 3-5 
25-8 
j 
20. 5 
2 5-1 
Ratio of E to 
mean. 
109 
«5 
120 
113 
104 
IOO 
no 
±2. 2 
Com: 
Plot B. 
2,900 
7, 000 
(°) 
4, 000 
3 , 7 oo 
8, 45 ° 
6, 200 
5,375 
Plot E. 
3.650 
4,780 
(a) 
c, 800 
c, 000 
8, 000 
6, 200 
5 > 572 
Ratio of E to 
mean. 
in 
81 
118 
US 
97 
IOO 
104 
±4* 2 
Flax: 
Plot B. 
6. 2 
12, 2 
e. 4 
12. 0 
Q. I 
16. 0 
10. 7 
10. 4 
Plot E. 
6. c 
14.1 
D *r 
4-9 
13. 2 
10. 7 
J 7 * 3 
IO.3 
n. 0 
Ratio of E to 
mean. 
102 
103 
95 
101 
108 
104 
IOO 
102 
±0, 9 
a Crop destroyed by hail. 
