40 BULLETIN 836, U. S. DEPARTMENT OF AGRICULTURE. 
Table XVI shows both the annual and the average acre yields at 
the rates of seeding specified in Table XV, so far as they are com- 
parable for either the 3-year period from 1916 to 1918, inclusive, or 
for the 5-year period from 1914 to 1918, inclusive. The highest 
annual acre yield of good brush produced at any rate was 710 pounds, 
which was from the thick rate or a stand of 8 to 10 inches of row 
space to the hill in 1915. The lowest acre yield, 186 pounds, was 
produced at this same rate in 1918. The highest average yield in 
both the 3-year and 5-year periods was produced at the rate of seed- 
ing with a stand ranging from 12 to 14 inches of row space to the 
hill. This is approximately the same rate per acre as one plant to the 
hill with hills spaced 6 to 7 inches apart in the row, which gave the 
highest average under the first method discussed. The differences 
between the 5-year average acre yields given in Table XVI are 
within the limits of experimental error. For a comparison between 
the methods, the data contained in Table X VI are repeated in Table 
XXII. 
TABLE XVI.—Annual and average acre yields of Acme broom corn in the com- 
bined rate-of-seeding and spacing experiments at the Woodward (Okla.) 
Field Station during periods of varying length in the five years from 1914 
to 1918, inclusive. 
[Two plants in each hill; rows spaced 3.5 feet apart.] 
Annual acre yields (pounds). Average yields. 
Distance = 3 years, 1916 | 5 years, 1914 
befweenhills: 1914 1915 1916 1917 | 1918 to 1918. to 1918. 
Spee whee ee ey 
Sa == 
Poor.|Good. Good.| Poor. Goo Poor. Good.| Poor. 
Good.) eed as | 
Se a See Pies Lee Pee 
8tol10inches.| 250} 100} 710} 160} 472 39 | 428 50} 186 €4 | 362 51} 409 e 
12to 14inches.} 275 60} 670] 1385) 556 50} 300} 122] 271 29 | 376 67 | 414 7 
18 to 2linches.}| 365 20} 69) 80} 511 44} 228 45 | 209 22} 313 37} 400 4 
23 to 28inches.| 340 10} 580 45} 400] 100] 289 39 | 343 14} 344 51} 390 42 
33 to 41 eae SABA n Peccse | apes MoSoee 305 56} 211 22 | 300 21 | 272 Sais Banas) S28 ee 
Poor. Sa Poor. 
FOUR PLANTS PER HILL, ROWS 3.5 FEET APART. 
Table XVII shows the agronomic data in the third section of the 
combined rate-of-seeding and spacing experiments, in which the 
plants were grouped four in each hill in rows spaced 3.5 feet apart. 
This method of spacing has been in use three years, from 1916 to 
1918, inclusive, and only two rates were sown each year. In the 
first or thick rate, the hills varied in row space from 17.6 inches 
in 1916 to 19.6 inches in 1917. This rate represents approximately 
the same number of plants per acre as the rate with one plant each in 
hills spaced from 4 to 5 inches apart in the row, which was con- 
sidered under the first method of spacing used in these experiments. 
The second or thinner rate in this method required a row space per 
he wh y 
PR 
A GA wa tons bad | eee ae Gk eT 
