COTTON IN WEEVIL-CONTROL EXPERIMENTS 



35 



and unstripped plants in the first three plantings shows that the 

 stripped plants grew larger than those not stripped, the increases are 

 hardly significant. 



Table 23. — Average height of stripped and of unstripped cotton plants grown in 

 successive plantings at Charleston on four different dates in 1923 





Average height on date given (centimeters) 



Planting date and 

 condition 



June 



4 



June 

 14 



June 

 21 



June 

 29 



July 



6 



July 

 13 



July 



21 



July 

 27 



Aug. 

 3 



Aug. 

 11 



Growth 

 from 

 June 

 21 to 



Aug. 11 



April 5 planting: 



IS. 6 



27.4 



35.3 

 37.3 



46.0 

 46.2 



54.7 

 51.9 



62.1 

 62.0 



68.6 

 67.4 



70.7 

 70.2 



73.3 

 71.8 



74.3 

 73.4 



39.0 





36.1 











Increase in 

 growth of 

 stripped 























2.9 



























Apr. 16 planting: 



21.8 



28.2 



35.9 

 33.6 



45.9 

 41.9 



55.3 

 49.2 



63.5 

 53.0 



76.1 

 58.4 



82.4 

 61.6 



85.2 

 65.4 



85.8 

 66.5 



49.9 





32.9 











Increase in 

 growth of 

 stripped 























17.0 



























Apr. 25 planting: 

 Stripped 



14.4 



19.2 



25.4 



27.7 



31.7 

 33.2 



38.7 

 41.1 



46.9 

 48.8 



58.0 

 57.4 



63.3 

 61.2 



67.0 

 64.4 



68.7 

 66.3 



43.3 





38.6 











Increase in 

 growth of 

 stripped 























4.7 



























May 4 planting: 

 Stripped 



12.0 



15.8 



21.3 

 22.8 



28.2 



31.5 



36.7 

 40.8 



47.2 

 50.6 



58.9 

 63.9 



64.1 

 70.8 



64.0 

 75.8 



65.4 

 78.1 



44. 1 





55.3 











Increase in 

 growth of 

 unstripped 























11.2 



















""" "| 





If acceleration of fruiting results from the removal of squares this 

 would be shown by an increase in the number of fruiting branches 

 or by an increased number of internodes on the branches. Weekly 

 records ol the number of fruiting branches from June 3 to August 1 1 

 on stripped and on unstripped plants are shown in Table 24. In the 

 stripped plants of the April 5 planting, from which 43.3 per cent of 

 the squares were removed on June 20, there was a total increase of 

 only four-tenths of a fruiting branch per plant for the entire seasbn. 

 The gain in the number of fruiting branches of 2.5 in the stripped 

 plants of the April 16 planting and 0.3 in that of April 25 with a loss 

 of 1.4 in the May 5 planting would indicate that no significant in- 

 crease in the number of fruiting branches was obtained by the removal 

 of squares. The stimulating effect of the removal of 43.3 per cent of 

 the squares was not sufficient to change materially the normal rate 

 of frui ting-branch production. 



' Martin, R. I)., W. W. Ballard, and I). M. Simpson. 

 Jour. Agr. Research, v. 25, p. 195-208, illus. 1923. 



Growth of fruiting parts in cotton plants. In 



