46 



BULLETIN 836, U. S. DEPARTMENT OF AGRICULTURE. 



was in use only three }^ears. from 1916 to 1918, inclusive. In that 

 time the first method of spacing, with one plant in each hill in rows 

 spaced 3.5 feet apart, gave the highest yield in one year only ; but its 

 average yield in the 3-year period exceeded that of any of the other 

 methods in use. 



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

 bined rate-of- seeding and spacing experiments at Woodward (Okla.) Field 

 Station in most or all of the five years from .19 14 to 1918, inclusive, shoicing 

 the results obtained at all rates of seeding in all methods of spacing, arranged 

 in fire groups, each containing rates having the same number of plants 

 per acre. 



Group A.— Average of 1 Plant to 4.5 Inches of Row Space, or 35,200 Plants to the Acre. 





Hills. 



Annual acre yields (pounds). 



Average yields. 



Distance be- 

 tween rows. 



Spacing (inches). 



w 



a 



c3 



1914 



1915 



1916 



1917 



1918 



3 vears, 

 1916 to 

 1918. 



5 vears, 



1914 to 



1918. 





. 



o 

 o 

 O 



O - 



o 



o 

 o 

 O 



o 

 o 

 .Ah 



is 

 o 

 o 

 O 



o 



o 

 Ph 



t5 



o 



o 

 O 







c 



PM 



■6 



o 

 o 

 O 



u 



o 

 o 

 Ph 



o 

 o 

 O 



Fh 



o 

 o 



Pi 



o 



o 

 O 



Fh 



o 

 o 

 Ph 



3.5 feet 



3.5 feet 



3 5 feet . 



4 to 5 



8 to 10 



17.6 to 19.6.. 

 2to3 



1 



2 

 4 

 1 



215 

 250 



90 



100 



775 



710 



87 

 160 



405 

 472 

 525 

 456 



65 

 39 

 65 

 38 



380 



428 

 469 

 325 



125 

 50 

 25 



81 



180 

 186 

 256 

 294 



34 

 64 

 38 

 37 



322 

 362 

 417 

 358 



75 



51 

 42 

 52 



391 

 409 



80 

 83 



7 feet 



275 



30 



570 



85 



384 



,54 







Group B. 



—Average of 1 Plant to 



6.5 Inches of 



Row 



Sp, 



\.ce, 



OR 24,400 



Plants to the Acre. 



3.5 feet 



6to7 



12 to 14 

 26.8 to 28.8.. 

 3.4 to 3.8.... 



1 

 2 



4 

 1 



305 



275 



60 

 60 



685 

 670 



110 

 135 



531 

 557 

 480 

 438 



44 

 50 

 50 

 50 



350 

 300 

 372 

 312 



90 

 122 



72 

 106 



281 

 271 

 242 

 238 



38 

 29 

 29 

 37 



387 

 376 

 365 

 329 



57 

 67 

 50 

 64 



430 

 414 



68 



3.5 feet 



79 



3 5 feet . 





7 feet 



205 



40 



530 



80 



345 



63 











Group C. — Average of 1 Plant to 9.5 Inches of Row Space, or 16,700 Plants to the Acre. 



3. 5 feet... 

 3.5 feet.. . 

 7 feet 



9 to 10. 



18to21 | 2 



4.6 to 5.4. 



1 



250 



20 



590 



75 



480 



75 



290 



55 



235 



25 



335 



52 



369 



2 



365 



20 



695 



80 



511 



44 



228 



45 



200 



22 



313 



37 



400 



1 



225 



25 



390 



50 



400 



44 



244 



50 



134 



41 



259 



45 



279 



Group D.— Average of 1 Plant to 12.5 Inches of Row Space, or 12,600 Plants to the Acre. 



3.5 feet . . 

 3.5 feet . . 

 7 feet.... 



11 to 14. 

 23 to 28. 

 6 to 6.4. 



1 



280 



10 735 



70 



415 



90 



295 



55 



257 



43 



322 



63 



396 



2 



340 



10 580 



45 



400 



100 



289 



39 



343 



14 



344 



51 



390 



1 



310 



15 463 



37 



363 



75 



231 



32 



325 



25 



306 



44 



338 



Group E.— Average of 1 Plant to 18.5 Inches of Row Space, or 8,500 Plants to the Acre. 



3.5 feet 



18 to 19 



33 to 41 



8 to 10 



1 



2 



1 











295 

 305 

 300 



120 



56 



S7 



330 

 211 

 220 



65 

 22 

 25 



288 

 300 

 256 



37 

 21 

 13 



304 

 272 

 259 



74 

 33 

 32 







3.5 feet 















7 feet 







465 



25 



















In summing up the results from the rate-of-seeding and spacing 

 experiments, it is interesting to note that the crop grown in rows 

 spaced 3.5 feet apart gave the highest average yield in all five groups 

 or rates in both the 3-year and the 5-year periods. The first method, 

 with one plant in each hill in rows spaced 3.5 feet apart, gave the 

 highest average yield in groups B, C, and E, or in three of the five 



