GRAIN-SORGHUM EXPERIMENTS IX OKLAHOMA. 
55 
slightly better than the 12-inch ones. With differences in distance 
between plants varying from 6 to 30 inches by 6-inch steps, the 
difference in the average yield between the spacings producing the 
highest and the lowest yields was but 4.4 bushels per acre per year. 
The difference between the high-yielding and the low-yielding rates 
for the individual years shows the following: 1917, 7.4 bushels; 1918, 
3.1 bushels: 1919T 15.2 bushels: 1920. 9.6 bushels; and 1921, 10.6 
bushels. These differences between the yields of the rates in the 
individual years are large and significant and are due to climatic 
conditions affecting the various rates differently. Considering the 
5-year average, a spacing of one plant to each 18 to 25 inches is to be 
desired, though a thicker or even a thinner stand should not be 
destroyed or lead the grower to resow. 
Table 24. — Yields of Dwarf Yelloiv milo in rows 44 inches apart in the spacing expi i- 
mints at the Woodward Field Station during the 5-year period from 1917 to 1921, 
inclusive. 
Row space per plant. 
6 to 9.9 inches... 
12 to 14.4 inches 
IS to 22.3 inches 
24 to 25 inches.. 
25 to 30 inches.. 
Rate 
No. 
Yields per acre (58-pound bushels). 
1917 
20.9 
17.9 
25.3 
20.2 
21.0 
19 Is 1919 
2.5 
2.1 
4.5 
3.3 
1.4 
27.6 
16.9 
15.0 
30.2 
23.2 
1920 1921 
28.1 
28.8 
25. 5 
37.7 
34.1 
41.0 
51.6 
51.4 
48.1 
43.7 
Aver- 
age. 
24.0 
23.5 
26.3 
27.9 
24.7 
SECOND DIVISION, ROWS 
INCHES APART. 
The second division of these experiments differs from the first in 
that the rows are 88 inches, or twice the distance, apart, and the 
plants are twice as thick in the rows, giving the same number of 
plants to the unit area as in the corresponding plats in the first 
division. 
Table 25 shows the data for Dwarf Yellow milo grown in rows 
spaced 88 inches apart in the spacing experiments during the 5-year 
period from 1917 to 1921, inclusive. In 1917 and 1918 the three 
thicker rates were thinner than was desired, but during the last 
three years the actual spacings between plants have been close to 
the desired spacings. The two thinner rates in 1917 and 1918 
were also approximately as desired. 
The tendency of milo in thin stands to produce suckers is as 
apparent when the rows are 88 inches apart as when the rows are 
but 44 inches apart. The row space per plant for rate 2 averaged 
3.62 inches, while that for rate 10 averaged 14.68 inches. The 
average stalk space, however, was 3.24 and 5.78 inches for rates 2 and 
10, respectively. As in division 1, the 44-inch rows, the number of 
suckers per plant increased with the distance between the plants. 
The percentage of erect heads varied from 100 per cent for all 
except the thinnest rate in 1918 to less than 40 per cent for certain 
3f the thinner rates in 1917 and 1921. As a general average, the 
milo in 88-inch rows had a low T er percentage of erect heads than the 
corresponding plats in 44-inch rows. This may be due to more 
vigorous growth at heading time of the plants in rows 88 inches 
apart than of the plants in 44-inch row^s. 
