May 3i, 1924 Comparison of Pima Cotton with Upland Varieties 
947 
Table VI. — Number of flowers produced and bolls shed per day , and number of bolls 
matured by 25 representative plants of six cotton varieties in 1923 —Continued 
Date 
Hartsville 
Durango 
Pima 
Acala 
Mebane 
Lone Star 
Flowers 
Bolls shed 
Bolls re¬ 
tained 
| Flowers j 
Bolls shed 
Bolls re¬ 
tained 
Flowers 
Bolls shed 
Bolls re- 
, tained 
Flowers 
Bolls shed 
Bolls re¬ 
tained i 
Flowers 
j ! 
Bolls shed 
Bolls re¬ 
tained 
! Flowers 
| Bolls shed 
! 1 
Bolls re- ! 
tained 
Sept. 9.. 
2 
1 
1 
8 
3 
5 
5 
0 
5 
0 
0 
0 
0 
0 
0 
10. 
1 
0 
1 
5 
1 
4 
0 
0 
0 
1 
0 
1 
0 
0 
0 
11. 
0 
0 
0 
3 
2 
1 
2 
0 
2 
0 
0 
0 
0 
0 
0 
12.... 
0 
0 
0 
2 
0 
2 
1 
0 
1 
0 
0 
0 
0 
0 
0 
13__ 
0 
0 
0 
6 
4 
2 
0 
0 
0 
0 
0 
0 
0 
0 
0 
14... 
1 
1 
0 
3 
1 
2 
3 
0 
3 
2 
0 
2 
0 
0 
0 
15. . 
3 
3 
0 
4 
0 
4 
1 
0 
1 
Total flowers_ 
1,356 
1,265 
1,157 
1,290 
1,101 
1,235 
Total bolls shed. 
987 
895 
339 
925 
803 
919 
Bolls retained... 
369 
370 
818 
365 
298 
316 
Per cent shed... 
72.8 
70.8 
29.3 
71.7 
72.9 
74.4 
Table VII.— Showing number of days after flowering at which bolls shed at the 
United States Field Station, Sacaton , Ariz., in 1922 and 1923 
1922 
1923 
Number of days 
after flowering 
Variety 
Vari. tv 
Acala 
Du¬ 
rango 
Pima 
! Lone 
! Star 
i 
Acala 
Du¬ 
rango 
Pima 
Lor e 
Star 
Ilarts- 
ville 
Me¬ 
bane 
1... 
1 
4 
4 
rv 
5 
2 
4 
3 
7 
2.. 
9 
32 
3 
16 
11 
2 
10 
9 
10 
13 
3...___ 
41 
60 
16 
36 
36 
14 
17 
29 
4__ 
101 
94 
2 
29 
97 
81 
17 
73 
60 
54 
5_ _ 
251 
186 
12 
83 
134 
158 
39 
128 
126 
190 
110 
148 
6.... 
319 
186 
16 
142 
169 
165 
37 
159 
7_ 
284 
199 
15 
124 
169 
132 
30 
183 
200 
172 
8. 
166 
119 
16 
110 
85 
81 
31 
120 
130 
165 
9___ 
74 
64 
10 i 
46 
47 
64 
21 
66 
73 
38 
10__ 
32 
52 
18 i 
36 
44 
38 
21 
48 
44 
43 
11.... 
31 
36 
13 1 
11 
32 
25 
10 
23 
22 
- 20 
12__ 
16 
27 
12 | 
14 
20 
21 
22 
15 
25 
11 
13.... 
12 
14 
13 | 
6 
20 
21 
13 
16 
13 
13 
14..... 
5 
19 
8 
9 i 
5 
11 
7 
9 
10 
13 
10 
15.__ 
5 
6 
2 
4 
14 
13 
8 
8 
5 
16.. 
3 
7 
4 j 
6 
6 
6 
13 
3 
4 
3 
17. . 
5 
6 
6 ! 
<-r 
4 
2 
7 
4 
17 
5 
18.__ 
3 
2 
1 f 
1 
2 
9 
4 
6 
2 
19.. 
2 
2 
4 ! 
1 
4 
3 
4 
2 
6 
1 
20___ 
1 
3 
3 i 
A i 
I 
4 
5 
5 
5 
1 
2 
Mean age at 
which bolls shed. 
6.7 
6.9 
10.1 j 
7.2 
7.0 
7. 2 
9.1 
7.3 
7.3 
7.2 
Data for two seasons on the number of bolls shed each day from the first to 
the twentieth day after flowering are shown in Table VII. While a few bolls 
were shed more than 20 days after flowering this was due to boll worm injury 
and is not included in the above table. Martin and Loomis found that with 
Pima cotton in Arizona the greatest shedding of bolls occurred between 4 and 
14 days after flowering. It will be seen from Table VII that the average age 
at which bolls of the Upland varieties shed was about 7 days, while the average 
age at which Pima bolls shed was about 10 days in 1922 and 9 days in 1923. 
