Sept. 9,1918 Deep Tilling and Dynamiting in the Great Plains 
503 
When studied by the number of trials that resulted either in favor of or 
against subsoiling, it was found that, while with oats, com, and winter 
wheat slightly more than half the trials resulted in favor of subsoiling and 
with spring wheat and barley slightly less than half, the deviations were 
not enough greater than their probable errors to make them significant. 
The effect upon flax is apparently not different from that on the small- 
grain crops. 
Table; XIII .—Summary table showing mean ratio a and probable error of mean of each 
crop at each station as shown in Tables I to XII , inclusive , and the general mean 
for each crop at all stations, and of all crops at each station 
Crop and factor. 
Judith 
basin. 
Huntley. 
Mandan. 
Belle¬ 
fourche. 
Ardmore. 
Scotts- 
bluff. 
Archer. 
Akron. 
Hays. 
Garden 
City. 
Amarillo. 
Tucum¬ 
cari. 
Mean and 
probable 
error. 
Spring wheat: 
98 
98 
x.6 
104 
89 
3-8 
XOI 
83 
9.6 
83 
104 
X03 
85 
95 ± 2 .I 
Probable error ± 
3-8 
3 
_ 
Winter wheat: 
105 
zoo 
107 
0.0 
74 
93 
Z09 
IOX 
87 
97 ± 2.6 
Probable error ± 
•9 
21.4 
4*4 
2 . 9 
1. 7 
6.1 
Oats: 
101 
103 
98 
IOI 
81 
97 
6.9 
99 
80 
Z 09 
IOI 
00 
00 
96±2.0 
Probable error± 
2 -3 
5*9 
s: 4 
7 * 9 
1.9 
s 
*• 3 
. 
_ 
Barley: 
99 
83 
10. 6 
98 
0. 8 
93 
99 
84 
4. 7 
zoo 
99 
70 
94 ± 2.5 
Probable error ± 
6 . 2 
8-5 
2. 4 
2.6 
12.0 
___ 
Com: 
104 
no 
96 
IOI 
9 X 
99 
105 
85 
Il6 
104 
94 
A. *1 
xoodbx.8 
Probable error± 
3 - 2 
7-8 
4 * 2 
4 * 1 
_ 
_ 
Flax: 
88 
ioo±4.6 
Probable error ± 
...... .. 
... 
_ 
Kafir: 
X20 
102 
iii±7*6 
Probable error ± 
4. 2 
1.4 
Milo: 
IOI 
90 
96 ±4.6 
Probable error ± 
2. 4 
1.4 
__ 
Broom com: 
92 
Probable error± 
12. 2 
Sorghum: 
96 
Probable error± 
Cotton: 
2. 2 
82 
Probable error ± 
5*8 
Mean ratio. 
103 
1.0 
IOX 
zoo 
98 
93 
98 
92 
85 
108 
102 
84" 
92 
Probable error.. ± 
3 .6 
i .6 
2 - S 
3 -i 
1. 2 
4.6 
1.4 
2.0 
•7 
2.5 
2. 2 
a Ratio based on yields of crops at the different stations as follows: Seed cotton, broom-corn brush, and 
sorghum forage at Tucumcari; com stover at Judith Basin, Archer, and Garden City; ear com at Huntley, 
Mandan, Bellefourche, Ardmore, ScottsblufF, Akron, Hays, and Amarillo; all other crops on yields of 
grain at all stations. 
TTafir at the two Stations from which results with this crop have been 
obtained appears to have given a markedly favorable response to subsoil- 
ing in comparison with the effect of that practice upon other crops, par¬ 
ticularly milo. This subject is being given much fuller investigation at 
a number of additional stations to which the crop is adapted. 
