12 
BULLETIN 214, U. S. DEPARTMENT OF AGRICULTURE. 
permit the taking of satisfactory samples for the study of soil moisture. 
Enough has been done, however, to make certain that only a limited 
supply of water available to the crop can be stored in the soil. This 
shallowness of the soil and the consequent limitation of the supply of 
water that can be stored in it and recovered by a crop make the crop 
dependent in large part upon the rains that fall while the crop is 
Table V. — Yields and cost of production of spring wheat by different methods at the 
Judith Basin Field Station, 1909 to 1914, inclusive. 
Treatment and previous crop. 
Number 
of plats 
aver- 
aged. 
Yield per acre (bushels) 
1909 
1910 
1911 
1912 
1913 
1914 
Average. 
Fall plowed: 
2 
2 
1 
31.3 
36.8 
33.4 
13.2 
11.5 
14.0 
21.4 
24.7 
22.0 
aH 
H 
H 
H 
H 
H 
H 
H 
H 
H 
H 
H 
24.9 
23.5 
18.5 
18.1 
19.1 
15.8 
21.8 
Oats 
23.2 
Wheat 
20.7 
5 
33.9 
12.7 
22.8 
23.1 
18.0 
22.1 
Spring plowed: 
1 
2 
2 
33.1 
&31.6 
35.6 
11.6 
10.0 
9.2 
21.3 
20.8 
24.1 
23.8 
24.1 
25.4 
18.5 
18.1 
16.7 
21.7 
Oats 
20.9 
Wheat 
22.2 
Total or average 
5 
c34.0 
10.0 
22.6 
24.5 
17.6 
21.7 
Listed: Wheat 
1 
1 
8 
33.3 
36.3 
35.0 
8.3 
15.0 
10.8 
26.5 
23.5 
23.9 
23.3 
22.8 
23.6 
17.1 
16.5 
19.4 
21.7 
Subsoiled: Wheat 
22.8 
Disked: Corn 
22.5 
Green manured: 
Rye 
1 
1 
34.0 
28.3 
9.0 
11.0 
19.0 
20.5 
28.0 
20.5 
15.1 
18.3 
21.0 
Peas 
19.7 
Total or average 
2 
31.2 
10.0 
19.8 
24.3 
16.7 
20.4 
Summer tilled 
4 
d34.1 
7.2 
20.1 
22.9 
19.5 
20.8 
Average of all 26 plats 
34.1 
10.6 
22.6 
23.6 
18.4 
21.9 
SUMMAKY OF YIELDS AND DIGEST OF COST. 
Tillage treatment. 
Previous crop. 
Yields, values, etc. (average 
per acre). 
FaU 
plowed 
(5 
plats). 
Spring 
plowed 
(5 
plats). 
Disked 
(8 
plats.) 
Listed 
(1 
plat). 
Sub- 
soiled 
(1 
plat). 
Green 
ma- 
nured^ 
plats). 
Sum- 
mer 
tilled 
(4 
plats). 
Corn 
(11 
plats). 
Small 
grain 
(9 
plats). 
Yields of grain: 
1909 bushels.. 
1910 do.... 
1911 do.... 
1912 do.... 
1913 do.... 
1914 do.... 
33.9 
12.7 
22.8 
H 
23.1 
18.0 
C34.0 
clO.O 
c22.6 
H 
24.5 
17.6 
35.0 
10.8 
23.9 
H 
23.6 
19.4 
33.3 
8.3 
26.5 
H 
23.3 
17.1 
36.3 
15.0 
23.5 
H 
22.8 
16.5 
31.2 
10.0 
19.8 
H 
24.3 
16.7 
d34.1 
d7.2 
20.1 
H 
22.9 
19.5 
«34.1 
ell. 3 
23.2 
H 
23.8 
19.1 
Z34.9 
/ll.l 
Z23.8 
H 
23.4 
17.5 
22.1 
21.7 
22.5 
21.7 
22.8 
20.4 
20.8 
21.9 
22.1 
Crop value, cost of produc- 
tion, etc.: 
S15. 47 
6.56 
$15. 19 
6.09 
S15. 75 
4.75 
§15. 19 
5.55 
$15. 96 
7.17 
814.28 
14.61 
$14. 56 
11.50 
Cost 
8.91 
9.10 
11.00 
9.64 
8.79 
- .33 
3.06 
a H= Destroyed by hail. 
b Yield of 1 plat only. 
c Average of 4 plats. 
d Average of 3 plats. 
« Average of 10 plats. 
/ Average of 8 plats. 
