6 
BULLETIN 546, U. S. DEPARTMENT OF AGRICULTURE. 
differences in the yields of the crops on the several plats would be 
associable with soil-moisture differences in the spring, as the only 
variation in the treatment of the land was the irrigation applied to 
half the plats in the fall of each year. 
CROP YIELDS. 
Two plats of each of the seven crops were grown each year on the 
fall-irrigated land, and the same number were grown on check series, 
the latter receiving no fall irrigation. The yields are reported in 
detail in Table III. 
Table III. — Yields of crops in the fall-irrigation experiments at the Belle Fourche Experi- 
ment Farm in 1914, 1915, and 1916. 
Plats and year. 
Series. 
Wheat. 
Oats. 
Barley. 
riax. 
Corn. 
Beets. 
Potatoes. 
Fall-irrigated plats: 
1914 
{ 
{ 
{ 
II 
IV 
II 
rv 
ii 
IV 
Bushels. 
31.5 
28.5 
24.0 
19.3 
15.5 
13.8 
Bushels. 
47.8 
39.0 
70.9 
60.6 
80.6 
72.2 
Bushels. 
29.1 
26.8 
35.7 
34.8 
39.2 
38.3 
Bushels. 
17.0 
10.5 
18.8 
16.3 
10.4 
9.1 
Bushels. 
53.4 
45.8 
29.3 
29.0 
50.4 
45.4 
Tons. 
8.9 
7.3 
5.1 
3.6 
13.2 
12.2 
Bushels. 
172 
1915 
127 
108 
1916 
77 
267 
254 
Average, three 
22.1 
61.9 
33.9 
13.7 
42.2 
8.4 
167 
{ 
{ 
{ 
I 
in 
i 
in 
i 
in 
Check plats: 
1914 
24.6 
19.3 
22.7 
24.5 
14.3 
15.3 
40.0 
47.8 
80.0 
80.3 
73.9 
84.7 
28.7 
26.0 
43.2 
33.5 
41.8 
43.6 
17.4 
14.8 
16.3 
19.1 
12.1 
11.8 
47.2 
51.4 
29.3 
33.7 
47.9 
53.9 
9.5 
7.1 
5.9 
5.7 
13.5 
13.9 
173 
1915 
158 
105 
1916 
100 
225 
272 
Average, three 
20.1 
67.8 
36.1 
15.2 
43.9 
9.2 
172 
In order to facilitate comparisons of the yields shown in Table III, 
r the figures have been calculated in percentages, and the relative yields 
are shown in Table IV, in which the yields of the check plats are repre- 
sented as 100 per cent. The yield shown for each crop is the average 
of duplicate plats. 
jTable IV. — Relative yields (expressed in percentages) of crops in the fall-irrigation experi- 
ments at the Belle Fourche Experiment Farm in 1914, 1915, and 1916. 
L 
1914 
1915 
1916 
3-year average. 
Crop. 
5 
o 
cu 
o 
,2, ** 
OS C 
o 
•6 
o 
"c3 
M 
Tj 
Ctf 
O 
3 
4 
® 
bO 
"3 
« 
Xi 
O 
co ' 
co Zl 
o E 
■-.— ■ 
OriC 
.2 
C3-2 S* 
3 
1 
o 
O 
Ml 
i Wheat 
137 
99 
102 
S5 
101 
98 
90 
100 
100 
100 
100 
100 
100 
100 
4-37 
- 1 
+ 2 
-15 
+ 1 
- 2 
-10 
92 
82 
92 
99 
94 
74 
90 
100 
100 
100 
100 
100 
100 
100 
-8 
-18 
- 8 
- 1 
- 6 
-26 
-10 
98 
96 
91 
88 
94 
93 
105 
100 
100 
100 
100 
100 
100 
100 
- 2 
- 4 
- 9 
-12 
- 6 
- 7 
+ 5 
110 
91 
94 
90 
96 
91 
97 
96 
100 
100 
100 
100 
100 
100 
100 
+ 10 
, Oats 
— 9 
Barlev 
— 6 
iFlax 
-10 
— 4 
Beets 
— 9 
— 3 
102 
100 
+ 2 
89 
100 
-11 
95 
100 
- 5 
100 
— 4 
