30 



BULLETIN 836, U. S. DEPARTMENT OF AGRICULTURE. 



brush if the crop is in the heading stage at that time. This may be 

 avoided by seeding either early or late. 



Table X. — Annual and average acre yields of Acme broom coin in date-of- 

 seeding experiments at the Woodward (Okla.) Field Station in the 5-year 

 period from- .1914 to* 1.918, inclusive. 





Annual 



acre yields (pounds). 







Average yields. 



Date of 

 seeding. 



1914 



1915 



1916 



1917 



1918 



2 rears, 1917 

 and 1918. 



3 years, 1916 

 'to 1918. 





Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



Good. 



Poor. 



April 16 















275 

 350 

 450 

 394 

 507 



68 

 106 

 81 

 39 

 36 



286 

 193 

 214 

 283 

 238 

 129 



57 

 50 

 14 

 28 

 12 

 142 



280 

 272 

 332 

 339 

 372 



62 



78 

 47 

 33 

 24 





May 1 and 2. . . 









717 

 556 

 378 

 328 



475 

 378 



457 



25 

 7 



55 

 22 

 68 

 55 

 57 



420 60 



Mav 1 4 and 15 . 



305 



60 







407 34 



May 22 to 27 .. 



600 



155 



352 



358 



41 



June 1 and 2. . 







23 



June 10 to 15 .. 







750 45 





June 18 to 22.. 







875 



630 



20 

 70 



625 

 633 



44 

 50 



| 







Julylto7 i 





260 



90 



446 70 



450 



66 























RATE-OF-SEEDING EXPERIMENTS. 



The rate-of -seeding experiments were conducted with Standard 

 broom corn. C. I. No. 556, and Dwarf broom corn, C. I. No. 557, 

 in the 5-year period from 1914 to 1918, inclusive. Both varieties 

 were sown in each year at three rates, designated as thick, normal, 

 and thin. These rates represent stands of approximately one plant 

 to 4 inches of row space in the thick rates, to 7 inches in the nor- 

 mal rate, and to 10 inches in the thin rate. All rows were spaced 3.5 

 feet apart. The combined rate-of-seeding and spacing experiments 

 with Acme broom corn, C. I. No. 243, have these same rates included. 

 A discussion of these experiments follows later. 



The agronomic data from the rate-of-seeding experiments are 

 shown in Tables XI and XII. It will be seen in Table XI that 

 the stand in each rate of seeding is not exactly the same for -both 

 varieties the same year; neither is it the same for each rate in the 

 different years. But the difference in the stands of the varieties in 

 the same rates in any one year is so small that its influence on yields 

 is considered negligible. 



The total growing period for the Standard broom corn in the 

 different years ranged from 94 days in 1914, the shortest time re- 

 quired, to 132 days in 1917, the longest. For the Dwarf variety in 

 these same years the time was 91 days and 117 days, respectively, 

 which is 3 days less in the first year mentioned and 15 clays less 

 in the second. In each of the other three years the Standard required 

 from 6 to 11 daj r s longer to mature than the Dwarf. 



In 1914 neither variety produced suckers. In 1915 none were 

 produced in the thick or the normal rates of the Standard broom 



