12 



BULLETIN 279, U. S. DEPARTMENT OF AGRICULTURE. 



spaced rows. The increase of inside rows, which approach most 

 nearly the conditions of uniform field culture, was 47 per cent in favor 

 of single-stalk rows. As will be shown later, the difference in yields 

 from these rows favored single-stalk culture in about the proportion 

 indicated by the number of bolls set. 



NUMBERS OF LOCKS IN THE BOLLS. 



Another census was made of bolls in single-stalk and wide-spaced 

 rows to determine the percentages of 3, 4, and 5 locked bolls produced 

 under the different systems of culture. Although the number of 

 locks, or carpels, is always a variable character, the relative number 

 of 3, 4, and 5 locked bolls is somewhat altered by different conditions 

 of culture or climate. For instance, under irrigation a higher per- 

 centage of 5-locked bolls is produced than under dry-land culture. 



In previous years it has been found that a . lower percentage of 

 5-locked bolls was produced under the single-stalk system of culture 

 than under the wide-spacing system, and the census taken at San 

 Antonio in 1914 corroborates these former results. To determine the 

 percentages of bolls with 3, 4, and 5 locks, a count of at least 300 bolls 

 was taken in each row and the number of locks recorded. It was, of 

 course, possible to secure the required number of bolls in less row 

 space in the single-stalk rows than in the wide-spaced rows. The 

 percentages of 3, 4, and 5 locked bolls in sections A and B are pre- 

 sented in Table V. 



Table V. — Ratio of 3-locked, 4-locked, and 5-locked bolls in rows ofAcala cotton in sections 

 A and B grown under the wide-spaced and single-stalk systems of culture, San Antonio, 

 Tex., 1914. 





Wide-spacec 



rows. 







Single-stall 



; rows. 





Row No. 



Locks 



n bolls— 





5-locked 

 bolls. 



Locks in bolls — 



5-locked 

 bolls. 





3 



4 



5 



Total. 



3 



4 



5 



Total. 



Alternate single rows 

 (section A): 



3 











Per cent. 





202 



165 



367 



Per cent. 

 45.0 



4 





91 



230 



321 



71.8 







5 





5 



193 



188 



386 



48. 7 



6 





168 



201 



369 



51.5 





7 





3 



199 



162 



364 



44.5 



8 



2 



156 



199 



357 



55.7 





9 



2 



200 



155 



357 



4.i. 4 



10 



1 



149 



154 

 142 

 161 

 192 



202 



1X1 

 171 

 207 

 169 



352 



335 

 313 

 368 

 361 



57.4 



51. 

 54.6 

 56.2 

 46.8 





Alternate 4 - row 



blocks (section B): 



58 













59 















60 















61 















62 









171 

 L86 

 ISO 



130 



133 



lie, 



120 

 202 



304 

 332 

 300 

 332 



43. 7 



63 















11.0 



64 















40. 

















60. 8 

















Total 



3 



0.08 



1,213 

 43.7 



1,560 



5(1. 2 



2, 776 

 100 





10 



0. 1 



1,461 

 53.3 



1,271 

 46.3 



2,742 

 100 





Per cent 



56.2 



46. 3 



