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 XVI are repeated in Table 

 XXI. 



Table XVI.— Annual and average acre yields of Acme broom corn in the com- 

 bined rate-of-seedmg 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 

 between hills. 



1914 



1915 



1916 



1917 



1918 



3 years, 1916 

 'to 1918. 



5 vears, 1914 

 to 1918. 





Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



8 to 10 inches. 

 12 to 14inches. 

 18 to 21 inches. 

 23 to 28 inches. 



250 

 275 

 365 

 340 



100 

 60 

 20 

 10 



710 

 670 

 695 



5S0 



160 

 135 

 80 

 43 



472 

 556 

 511 

 400 

 303 



39 

 50 

 44 

 100 

 56 



428 

 300 

 22 S 

 289 

 211 



50 

 122 

 45 

 39 

 22 



186 

 271 

 200 

 343 

 300 



64 

 29 

 22 

 14 



21 



362 

 376 

 313 

 344 

 272 



51 

 67 

 37 

 51 

 33 



409 

 4)4 

 400 

 390 



83 

 79 

 42 

 42 

















FOTJE 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 



