34 



BULLETIN 836, TJ. S. DEPARTMENT OF AGRICULTURE. 



broom corn in the 5-year period from 1914 to 1918, inclusive. It 

 may be noted in this table that the highest yield of good brush from 

 the Standard variety in any year was 538 pounds, produced by seed- 

 ing at the thick rate in 1915, and the lowest yield was 125 pounds, 

 from seed sown at the same rate in 1918. The annual yield from the 

 normal rate of seeding in the five years exceeded that of the other 

 rates in two years only, but the 5-year average yield of this rate is 331 

 pounds. This is 18 pounds more than the average yield at the thick 

 rate and 49 j)oimds more than the average yield from the thin rate 

 in. the 5-year period. The normal rate of seeding, or a stand of one 

 plant to G or 8 inches of row space, appears to be the most profitable 

 rate for a series of years. 



From the Dwarf variety the highest annual yield of good brush in 

 the 5-year period was 6GT pounds, which was produced by seed sown 

 at the thick rate of 1915. The lowest yield, 130 pounds, was produced 

 at this same rate of seeding in 1914. The normal rate produced a 

 higher yield than either the thick or thin rates in only one year in the 

 5-year period. However, the normal rate produced a fair yield each 

 year and averaged 387 pounds in the 5-year period. This is 19 

 pounds more than the average of the seeding at the thick rate and 

 7 pounds more than the average yield at the thin rate in the 5-year 

 period. From these results it will be seen that in a series of years, in- 

 cluding both favorable and unfavorable seasons, the normal rate or 

 a stand providing G to 8 inches of row space to the plant is the most 

 profitable rate of seeding and the one that should be used for this 

 variety under similar conditions. 



Table XII. — Annual and average acre yields of Standard and Dwarf broom 

 corn in rate-of -see ding experiments at the Woodward (Okla.) Field Station 

 during the 5-year period from JUL'/ to 1918, inclusive. 







Annual acre yields (in pounds). 







Average 



yields 



for the 



5 years, 



1914 to 1918. 



Variety and rate. 



1914 



1915 



1916 



1917 



1918 





Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Standard: 



Thick 



150 

 225 

 212 



130 

 250 



300 



90 

 75 

 69 



60 

 100 

 50 



538 

 440 

 295 



667 

 650 

 594 



118 

 235 

 220 



133' 



205 



150 



372 

 367 

 385 



440 

 361 

 420 



78 

 38 

 40 



80 

 78 

 50 



380 

 350 

 260 



390 

 378 

 305 



45 

 31 

 50 



100 



77 

 100 



125 

 275 

 260 



215 

 294 



280 



55 

 30 

 30 



45 

 £8 

 20 



313 

 331 



282 



368 

 387 

 380 



77 





82 



Thin 



82 



Dwarf: 



Thick 



84 





98 



Thin... 



74 











COMBINED RATE-OF-SEEDING AND SPACING EXPERIMENTS. 



The combined rate-of-seeding and spacing experiments were con- 

 ducted with Acme broom corn and consist of different rates of seed- 



