44 



BULLETIN 836, U. S. DEPARTMENT OF AGRICULTURE. 



the thinner stands outyield the others. It is necessary, therefore, to 

 study the average yields for a period of years in order to determine 

 the most profitable rate of seeding and spacing. 



The annual and average acre yields are shown in Table XX. It 

 will be noted in this table that rates which show a slight variation 

 in row space per hill in the different years are considered comparable 

 and treated as a single rate. Five rates are presented here. The 

 lowest annual acre yield of good brush was 134 pounds, made at the 

 4 to 5 inch rate in 1918, and the highest yield was 570 pounds, made 

 with the 2 to 3 inch spacing in 1915. This spacing made the best 

 yield in four out of the five years and gave the highest average in 

 both the 3-year and the 5-year periods. The next highest average in 

 both these periods was from the spacing varying from 3.4 to 3.8 

 inches. The lowest 5-year average yield was with the 4 to 5 inch 

 spacing, and this rate tied with the 8 to 10 inch spacing for low yield 

 in the 3-year period. 



Table XX. — 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. 



[One plant in each hill; rows spaced 7 feet apart.] 









j 



L nnual 



acre yield (pounds). 







' 



\_verag 



e yield 





Distance 

 between hills. 



1914 



191.5 



1916 



1917 



1918 



3 years, 1916 

 'to 1918. 



5 years, 1914 

 to 1918. 





Good. Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. Poor. 



2 to 3 inches... 

 3-4to3.8inches 

 4.6 to 5.4 inches 

 6 to 6.4 inches. 



275 

 205 

 225 

 310 



30 

 40 

 25 

 15 



570 

 530 

 390 

 463 

 465 



85 

 80 

 50 

 37 

 25 



456 

 438 

 400 

 363 

 300 



38 

 50 

 44 

 75 



87 



325 

 312 

 244 

 231 

 220 



81 

 106 

 50 

 32 

 25 



294 

 238 

 134 

 3'5 

 236 



37 

 37 

 41 

 25 

 13 



358 

 329 

 259 

 306 

 259 



52 

 64 

 45 

 44 

 32 



384 

 345 

 279 

 338 



54 

 63 

 42 

 37 











COMPAKATrVT; YIELDS FEOM ALL METHODS OF SPACING. 



In Table XXI all comparable rates of seeding in the different 

 methods of spacing used in these experiments are presented, so that 

 comparisons may be made easily between the annual and average 

 acre yields from all methods of spacing. Five different rates are 

 represented here, and these are distributed into five groups, each one 

 containing different combinations having the same number of plants 

 per acre. Data given for each group are the distance between the 

 rows in feet, the row space to the hill in inches, the number of plants 

 in each hill, and the annual and average acre yield for each method 

 of spacing. 



Group A contains the data for the thick rate in each method of 

 spacing. This rate represents an average of approximately one 



