20 
BULLETIN 1365, XJ. S. DEPARTMENT OF AGRICULTURE 
The only reason suggested for more squares having a dormant 
stage before shedding in 1925 was that the plants were carrying a 
much larger crop of bolls throughout the season than in the preced- 
ing year, so that stress conditions may have been more severe on 
the outer nodes of the fruiting branches and on the short branches at 
the top of the plants. At least there was some condition that caused 
the squares to cease growing, perhaps a lessened food supply. No 
greater lengthening of the period before shedding was observed for 
any of the squares borne on the single-noded fruiting branches at 
the base of the main stalks of the vegetative limbs than on node 1 
of longer fruiting branches, and they were included in the data 
under node 1 in compiling Table 12. 
Table 12. — Mean age at time of shedding of the squares that appeared in \3-day 
intervals throughout the season of 1925 on specific nodes of the fruiting branches 
of 20 plants each of Pima and Acala cotton, data for main stalks and vegetative 
limbs being considered separately 
o 
a 
XJ 
o 
a 
S 
bO 

'5 
Pima 
Acala 
Main stalk 
Vegetative limbs 
Main stalk 
Vegetative limbs 
10-day interval 
o 
CO 
3 to 
52! 
Age at time 
of shedding 
(days) 
o 
CO 
u p 
® 53 
E^ 
3 ra 
Age at time 
of shedding 
(days) 
p 
u s> 
° is 
11 
3 w 
5 
Age at time 
of shedding 
(days) 
3 on 
5 
Age at time 
of Shedding 
(days) 
1! 
l 
2 
< 3 
1 * 
I 5 
f 1 
2 
1 3 
4 
I 5 
( 1 
2 
\ 3 
4 
I 5 
f 1 
1 2 
' 3 
4 
1 5 
f 1 
2 
1 3 
4 
I 5 
13 
31 
18 
11. 538±0. 625 
13.032=1= .278 
10.778=fc .354 
10 
11.000=1=1.251 
21 
20 
13 
9 
17 
16 
13 
26 
21 
11 
19 
16 
31 
26 
4 
8 
14 
17 
10 
5 
8 
16 
10 
21 
6 
4 
8. 619=1=0. 542 
9.300=t .733 
8.923=1=1.224 
10. 889=fcl. 168 
10. 176=1= . 834 
8.875=1= .791 
12. 923=1=1. 503 
14.654=1= .850 
16. 571=1=1, 014 
14.818±1.025 
14.211=1= .815 
14.687± .808 
17.452=1= .545 
16. 923d= . 641 
19. 250=1=1. 398 
19. 750=1=1. 811 
19. 786=1=1. 516 
18. 941=1= . 914 
22.100=1=1.313 
13.000± .895 
16. 875=fc. . 786 
14.937=1= .975 
20.000=1=1. 421 
22.048=1= .755 
20.000±1.582 
21.000=1=1. 390 
20 
13.050=1=0.902 
June 8 to 17.. 
8 
14 
15 
12 
12.875=1=1.833 
14. 500=1=1. 297 
16. 933=1=1. 350 
22. 667±1. 470 
30 
19. 867=1= . 961 
24 
15 
16.083± .760 
16.600=1= .744 
June 18 to 27. 
June 28 to July 7 
6 
13 
24 
15 
14 
4 
17 
20 
21 
10 
4 
16 
13 
15 
4 
3 
12 
12 
3 
6 
19. 333±1.971 
18.846=1= .907 
15.708± .366 
19. 200=1= . 446 
18.714=!= .588 
24.500±1.204 
15.706=1= .791 
15.200=1= .446 
18. 952=fc . 881 
19.600=1=1.137 
15.000=1=1. 328 
16. 125=1= . 690 
15.154=1= .381 
21. 933=1=1. 260 
20.000±1.328 
26.667±1.863 
15.833=b .888 
16. 583=1= . 747 
17.667±1.324 
20.000± .967 
18 
4 
21.222=1= .984 
20. 5C0± . 377 
12 
6 
5 
18. 667=1=1. 110 
19. 500=1=1. 769 
16.200=1= .400 
July 8 to 17 
12 
5 
18.835±1.315 
20. 400=1=1. 510 
6 
7 
28. 167=1=1. 324 
24. 429=1=1. 535 
7 
6 
19. 143=1=1. 303 
15.333=fc .519 
July 18 to 27 
4 
18. 500±1. 106 
July 28 to Aug. 6 
4 
5 
21.000± .413 
18.200± .818 
1 
In Tables 13 and 14 the squares that were shed from the last node 
of long fruiting branches of the Pima, either on the main stalks or on 
the vegetative limbs, were not appreciably different in age from those 
shown in Table 12, whereas those from the short one-node branches 
at the top of the main stalks or of the vegetative limbs were older, 
although the difference in age might not appear so great with a larger 
population in this class. In the Acala the squares on the last node of 
long fruiting branches and those on branches of one node only, at the 
top of the plants, were considerably older when shed than squares in 
the corresponding 10-day intervals shed from specific nodes, as shown 
in Table 12. 
