88 BULLETIN 1320, U. S. DEPARTMENT OF AGRICULTURE 
In plats 5 and 6, where the April 5 and May 4 plantings were grown 
side by side, 7 per cent more flowers were recorded from the May 4 
planting. Owing to a high rate of boll shedding during late July and 
in August, few bolls were matured from flowers produced during that 
time. 
Data were obtained from 20 plants of each of the four plantings, 
showing the number and percentage of bolls set from flowers which 
opened during weekly periods from July 7 to August 14. Data from 
these 80 plants are combined and presented in Table 27. During the 
week from July 7 to 14, 80.9 per cent of the flowers were set as bolls. 
Only 47.1 per cent of the flowers produced during the following week 
were set and 15.2 per cent during the third week. This declining rate 
of boll setting continued during the period from August 7 to 14, 
when only 3.1 per cent of the flowers set. Thus, the larger numbers 
of flowers produced by the later plantings during late July and August 
were of little value in setting a crop under the conditions of this 
experiment. 
TABLE 27.—Numober of flowers recorded and number and percentage of bolls set on 
80 cotton plants at Charleston during each of five weekly periods in 1923 
Tent July 7 July 15 | July 23 |} July 31 | Aug.7 
to 14 to 22 to 30 to Aug. 6 to 14 
ESR CES ete ec eae eeepc A ee leg NL Sah cape aye ee 157 276 296 205 162) 4 
Bolls: 
INGULTUTD OT Fe Sr te ete ieee ee ada 127 130 45 14 
Percentagejw ss et ier se BO Nb mena ean | 80. 9 47.1 15.2 6.8 3.1 
YIELDS FROM SUCCESSIVE PLANTINGS AT CHARLESTON 
As a result of complete defoliation of the plants by leafworms, the 
bolls opened rapidly during the latter part of August, and the bulk of 
the crop was open the first week in September. ‘The first picking was © 
made on September 10 and a small second picking on October 4. The — 
field was divided into equal sections by a line across the center of the © 
field at right angles to the rows. Hach section of each row was picked 
separately and weighed on scales graduated to one-tenth of a pound. 
The picking results are given in Table 28 and graphically presented in 
Figure 10. 
Plant counts for each section of row are included in Table 28. | 
Irregular stands resulted in considerable variation in the number of — 
penis per row. While higher yields would be expected in rows 
aving a perfect stand, it has been found impracticable to make cor-_ 
rections in the yields on account of deficient stands. 
The yields from the four inside rows in each plat are used for com-_ 
parisons between different plantings. The yields of outside rows 
were affected by adjoining plats of earlier or later plantings. 
The total yields from the first and second plats of each planting | 
are as follows: April 5, 279.5 pounds; April 16, 244.9 pounds; April | 
25, 235 pounds; May 4, 222.4 pounds. While these figures show an | 
increase for the early-planted cotton, reference to the plat yields in 
Table 28 indicate that most of the gain was due to better soil on one | 
side of the field. Plat 2, planted April 5, yielded 158.5 pounds, while | 
plat 6, planted on the same date, yielded 121 pounds. Plats 3 and 7, | 
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