58 BULLETIN 1175, U. S. DEPARTMENT OF AGRICULTURE. 
about 20,000 plants to the acre. The highest yield, 42.1 bushels, 
from this rate was made in 1921 from rows spaced 88 inches apart 
and the lowest yield, 2.5 bushels, from rows 44 inches apart in 1918. 
The 5-year average yields for this rate are 0.7 bushel in favor of the 
44-inch rows. The plats grown in 1921 from this rate in 44-inch and 
in 88-inch rows are shown in Plate VI. 
Group B represents an average stand of one plant to each 13 inches 
of row space for the rows 44 inches apart and one to each 6.6 inches 
for the 88-inch rows, or approximately 11,000 plants to the acre. 
The 44-inch rows outyielded the 88-inch rows in but two of the five 
years, 1917 and 1921, and the 5-year average yield is 1.5 bushels in 
favor of the 88-inch rows. This is the only one of the five different 
rates that gave a higher 5-year average yield for the rows spaced 
88 inches apart than for the corresponding stand in 44-inch rows. 
This spacing in 44-inch rows, 12 to 14 inches between plants, gave 
the lowest 5-year average yield for rows spaced this distance apart, 
in spite of the high yield made from this spacing in 1921. The 
comparatively low yield from this spacing is associated with a low 
percentage of stalks producing heads, which was especially noticeable 
in 1917 and 1919. Observations in the plats showed that the plants 
at this spacing had a tendency to produce one to two suckers to the 
plant and that these suckers ordinarily were unable to produce good 
heads. In the thinner rates the suckers generally produced as good 
heads as the main stalk, while in the thicker rate (one plant to each 
7.2 inches) there were few suckers and the main stalk generally 
produced a fair head. 
Group C, with an average stand of one plant to each 19.3 inches in 
the rows spaced 44 inches apart and one plant to each 9.8 inches in 
the 88-inch rows, averaged approximately 7.400 plants to the acre. 
In 1918, 1919, and 1920 the 88-inch rows outyielded the 44-inch rows, 
but the 5-year average yield is in favor of the 44-inch rows by 0.5 
bushel. This spacing produced the second highest average yields 
from both the 44-inch and 88-inch rows. 
Group D averaged one plant to each 24.4 inches of row space in the 
rows 44 inches apart and one plant to each 12.1 inches in the rows 88 
inches apart, or approximately 5.900 plants to the acre. In this rate 
the rows 88 inches apart made higher grain yields in 1918 and 1920 
than the rows 44 inches apart, but the 5-year average yield is 1.5 
bushels per acre in favor of the rows 44 inches apart. This spacing, 
approximately 6,000 plants per acre, made the highest 5-year average 
yield in both the 44-inch and 88-inch rows, indicating that it is near 
to the best spacing for Dwarf Yellow milo under the conditions at the 
Woodward Field Station. 
Group E is the thinnest rate tried. An average of one plant to 
each 29.5 inches of row space in rows 44 inches apart and of one plant 
to each 14.7 inches in rows 88 inches apart was obtained, approxi- 
mating 4,800 plants to the acre. In three of the five years the 44- 
inch rows outyielded the 88-inch rows, and the 5-year average yield 
from the 44-inch rows is higher by 1.1 bushels per acre. This spacing 
of the plants, 30 inches and 15 inches in rows 44 and SS inches apart, 
respectively, is slightly too thin to enable Dwarf Yellow milo to re- 
turn maximum yields under the conditions prevailing at the Wood- 
ward Field Station. 
