GRAIX-SORGHUM EXPERIMENTS IN OKLAHOMA. 
63 
TABLE 
32. — Yields oj Sunrise hafir in the spacing experiments at the Woodward Field 
Station during the 5-year period from 1917 to 1921, inclusive. 
Space (inches) 
between— 
Yield per acre (60-pound bushels). 
Group and approximate number of 
of plants per acre. 
Rows. 
Plants 
in the 
row. 
L9i; 
191S 1919 1920 
1921 
Aver- 
age. 
Group A, 21,000 plants j ^ 
Group B, 11 ,0X1 plants { JJ 
Group C, 8,000 plants { JJ 
Group D, 5,900 plants j ^ 
Group E, 4,800 plants { ^J 
6.8 
3.5 
12.3 
6.1 
17.6 
9.1 
23. 9 
12.3 
29.4 
14.8 
29.2 
19.9 
28.8 
22.5 
30.0 
22.5 
21.8 
27.0 
19.7 
7. 8 
11.0 
9.7 
11.1 
8.6 
ll.o 
12.6 
26.0 
25.3 
27.7 
22.3 
24.7 
19.7 
26.2 
24.0 
32.8 
?3.1 
32.1 
26.4 
34.1 
30.4 
33.9 
30.2 
35.5 
30.4 
33.8 
28.7 
38.1 
30.2 
37.5 
31.1 
36.8 
30.0 
31.4 
24.4 
28.2 
24.5 
22.6 
27.6 
23.5 
22.2 
26.4 
22.7 
26.5 
21.7 
Group B has a stand of one plant to each 11.8 to 13.1 inches in 
rows 44 inches apart and one to each 5.3 to 6.9 inches in rows 88 
inches apart, or approximately 11.000 plants to the acre. It is 
interesting to note that this spacing has made the highest average 
grain yields in both the 44-inch and the 88-inch rows. The rows 44 
inches apart have averaged 4.1 bushels per acre a year more than the 
rows spaced 88 inches apart. 
Group C represents a rate of one plant to each 16 to 18.4 inches 
of row space in the 44-inch rows, or one to each 8.8 to 9.5 inches in 
the 88-inch rows, approximately 8,000 plants to the acre. In the 
five years the 44-inch rows have averaged 4.6 bushels per acre a 
year more than the 88-inch row-. 
Group D has had a stand of one plant to each 23.5 to 24.5 inches 
in the 44-inch rows and one plant to each 11.6 to 13 inches in the 
rows 88 inches apart, or approximately 5.900 plants to the acre. 
At this spacing the 44-inch rows have averaged 3.7 bushels per acre 
a year more than the 88-inch rows. 
Group E is the thin rate of spacing. It has averaged one plant to 
29.4 inches of row space in the 44-inch rows and one to each 14.8 
inches in the 88-inch rows, or approximately 4,800 plants to the acre. 
The plats grown in 1921 at these spacings are shown in Plate VII. 
The 44-inch row plats have outyielded the -88-inch row plats by an 
average of 4.8 bushels per acre a year in the five years. 
These data show that the wide-spaced rows, 88 inches apart, have 
outyielded the rows spaced 44 inches apart in but one year, 1918, 
and in that year the difference was only from 0.1 to 3.2 bushels per 
acre in the different rates in favor of the 88-inch rows. The 44-inch 
rows have exceeded the 88-inch rows in average yield during the 
5-year period by from 4.8 to 3.7 bushels for the various stands. 
Considering grain yield alone, the 88-inch rows are not to be recom- 
mended for Sunrise kafir under the conditions at the Woodward 
Field Station. The best rate for Sunrise kafir is approximately one 
plant to each 12 inches of row space in 44-inch rows. The extreme 
difference obtained in spacing plants from 6 to 30 indies apart in 
