38 BULLETIN 836, U. S. DEPARTMENT OF AGRICULTURE. 
The annual yields of brush are shown in Table XIV, together 
with 3-year and 5-year averages, so that comparisons may be made 
readily between the yields from different rates. These same data 
are shown again in Table XXI with similar data regarding other 
methods of spacing, for comparison between methods. Those rates — 
which are comparable for at least three years are shown in Table 
XIV. Rates that did not differ more than 1 inch in row space per 
hill in the different years are treated as one rate of seeding. The 
same is true of the 6 to 7 inch and the 9 to 10 inch stands. The 11 
to 14 inch stands are grouped as one rate also, though they cover 
a larger difference (3 inches) in row space per hill. 
TABLE XIV.—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 5-year period from 1914 to 
1918, inclusive. 
[One plant in each hill; rows spaced 3.5 feet apart.] 
Annual acre yields (pounds). - Average yields. 
Distance - 3 years, 1916} 5 years, 1914 
between hills.| 1914 Ms Rule ee mate to 1918. | to 1918. 
H | 
Good.| Poor.|Good:| Poor.|Good.} Poor.|Good.| Poor.|Good.| Poor.|Good.} Poor.|Good.| Poor. 
4 to 5inches...} 215 90 | 775 87 | 405 65 | 380] 125} 180 34 | 332 75 | 391 80 
6 to 7inches.-..| 305 60 | 685} 110] 531 44 | 350 90 | 281 38 | 387 57 | 430 - 68 
9to10inches-.-| 250 20 | 599 75 | 480 75 | 290 50 | 235 25 | 335 52 | 369 50 
11 to14inches.| 280 10} 735 70} 415 90} 295 55 | 257 43 | 322 63 | 396 54 
ike} HOOT VES Soca ss acnceclnoeoss|saesoe 295 | 120 | 330 65 | 288 37 | 304 TN Re merase Se he 
The highest annual yield of good brush produced in the 5-year pe- 
riod was 775 pounds from the 4 to 5 inch rate in 1915, and the lowest 
annual yield was 180 pounds from this same rate in 1918. Here it is 
seen that the rate which yields highest in a favorable season yields 
lowest in an unfavorable one. Therefore, the most profitable rate is 
one that makes fair to good yields each year and a fair average yield 
in a series of years. The highest average yield in both the 3-year 
and the 5-year periods was made by the 6 to 7 inch rate. This rate 
averaged 387 pounds of good brush in the 3-year period from 1916 
to 1918, inclusive, or 52 pounds more than its nearest competitor. In 
the 5-year period, from 1914 to 1918, inclusive, the 6 to 7 inch rate 
averaged 430 pounds of good brush. The next highest was 396 
pounds from the 11 to 14 inch rate, or 34 pounds less. 
TWO PLANTS PER HILL, ROWS 3.5 FEET APART. 
Table’ XV shows the agronomic data from rows spaced 3.5 feet 
apart with plants grouped two in each hill in the rate-of-seeding and 
spacing experiments. In this second section of the experiments each 
hill contains two plants instead of one, and the hills occupy twice the 
tn Pitts ete nie ptt ds van 
