COTTON IN WEEVIL-CONTROL EXPERIMENTS 



39 



planted April 16, yielded 136.8 and 108.1 pounds, respectively. 

 Plats 4 and 8, planted April 25, yielded 130.6 and 104.4 pounds, and 

 Nos. 5 and 9, planted May 4, yielded 111.8 and 110.6 pounds, 

 respectively. 



The fact that such wide differences in yield occurred on the first 

 and second plats of the first three plantings indicates that the high 

 yields from the first plats were due to more fertile soil in that part 

 of the field. The yields from the first and second plats of the May 4 

 planting were practically equal, and comparatively small differences 

 in the yield of the different plantings occurred on plats 5, 6, 7, 8, and 

 9. Plat 5, planted on May 4, yielded only 10 pounds less than plat 5, 

 planted on April 5. 8 (PI. V.) 



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Fig. 10. — Row yields from successive plantings of cotton at Charleston, S. C, April 5 to May 4 



Table 28. — Yield of seed cotton grown in successive plantings at Charleston on four 



different dates in 1923 





Row 

 No. 









Yields of seed cotton (pounds) 



Date planted and plat number 



Number of plants 



First 

 picking, 

 Sept. 10 



Second 



picking, 



Oct. 4 



Total 





Sec- 

 tion 

 A 



Sec- 

 tion 

 B 



Total 



Sec- 

 tion 



A 



Sec- 

 tion 

 B 



Sec- 

 tion 

 A 



Sec- 

 tion 

 B 



Sec- 

 tion 

 A 



Sec- 

 tion 

 B 



Row 





1 



214 



220 



440 



17. 1 



16.1 



1.7 



2.5 



18.8 



18.6 



37.4 



Plat No. 2 



f 2 



208 



21 1 

 212 



232 



207 

 209 

 231 



240 



415 

 450 

 473 

 472 



17.8 

 18.7 

 17.2 

 17.0 



18.1 

 19.5 

 17.4 

 19.6 



1.6 

 1.2 

 1.4 

 1.6 



2.0 

 1.4 

 2.1 

 1.9 



19.4 

 19.9 

 18.6 



18.6 



20. 1 

 20.9 

 19.5 

 21.5 



39.5 

 40.8 

 38.1 

 40.1 



Total 





923 



887 



1,810 



70.7 



74. 6 



5.8 



7.4 



7ii. 5 



82. 



158.5 





6 



7 



242 

 136 



224 

 211 



466 



347 



18. 1 

 15.6 



20.2 

 17.fi 



1.8 



1.7 



2.0 

 2.4 



19.9 

 17.3 



22. 2 

 20. 



42.1 

 37. 3 



' l!v i-..-.\i ■!.:.;! in;- i ;..• probable error of the avenge row yield of these two plats, the difference in yield 



irand to be only three times the probable error of the difference. As the average row yields were 



obtained from only eight rows, a difference of three times the probable error Is not considered significant. 



