COTTON IN WEEVIL-CONTROL EXPERIMENTS 89 
lanted April 16, yielded 136.8 and 108.1 pounds, respectively. 
Piats 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 119.6 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 5.2. (Pl. V.) 
SLC7VIONW 2 
% 
120.15 APL ZE\IIAY F \ APES VIE | APELE AY #\ APCS 
74 reg 7 F¥ a So “a oa a 7? 
SLATS 
Fic. 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 
Yields of seed cotton (pounds) 
| 
Number of plants First Gaeond 
Po picking, | picking, Total 
Date planted and plat number NG Sept. 10 Oct. 4 
See- | See- See- | See- | See- | Sec- | Sec- | Sec- 
tion | tion | Total] tion | tion | tion | tion | tion | tion | Row 
A B i B A | B A B 
| TBS SESS acl ek ea RA peo et oe 1 | 214 |. 226 440 | 17.1 | 16.1 LES alle Davy Be toy |! aie (es 37.4 
| 2 208 | 207 415 | 17.8 | 18.1 1.6 2.0 | 19.4 | 20.1 39.5 
Plat No. 2 3 241 209 450 | 18.7 | 19.5 igy 1.4 | 19.9 | 20.9 40.8 
Teg a ee ee 4 242 231 473 | 17.2 | 17.4 1.4 2 NLS 6a L900 38. 1 
3 232 240 472 | 17.0 | 19.6 1.6 TOE T8263 2105 40.1 
AN) 21 tee ate 1 Jar aire aL | 923 887 |1,810 | 70.7 | 74.6 5.8 7.4 | 76.5 | 82.0 | 158.5 
6 242 | 294 466 | 18.1 | 20.2 1.8 250) (TON9s 2282 42.1 
Ze 136 211 347 | 15.6 | 17.6 eG 2.4 | 17.3 | 20.0 3.3 
_ § By calculating the probable error of the average row yield of these two plats, the difference in yield 
was found 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. 
