950 
Journal of Agricultural Research 
Vol. XXVIII, No. 9 
ings were made, in both 1922 and 1923, was somewhat impervious to irrigation 
water and impregnated with alkali, thus representing rather unfavorable condi¬ 
tions for crop production. The yields obtained in both years are given in Table X. 
Table X.— Comparative yields of late planted Acala and Hartsville cotton varieties 
in 7-row plats at the United States Field Station , Sacaton, Ariz. } in 1922 and 1923 
1922 
1923 
Row No. 
Date planted 
Date planted 
June 22, 
Acala 
June 5, 
Harts¬ 
ville 
Apr. 30, 
Acala 
Apr. 30, 
Harts¬ 
ville 
May 20, 
Acala 
May 20, 
Harts¬ 
ville 
1 ........ 
Lbs. 
16.1 
Lbs. 
14.4 
Lbs. 
21.3 
Lbs. 
12.7 
Lbs. 
29.4 
Lbs. 
16.5 
2 ........ 
12.7 
14.0 
27.5 
17.0 
28.3 
16.9 
3....... 
13.6 
15.1 
24.6 
19.1 
32.4 
22.2 
4...... 
17.3 
24.1 
19.8 
25.8 
23.0 
5...... 
14.1 
22.9 
29.8 
31.8 
23.0 
6 ..... 
15.1 
24.0 
31.7 
21.6 
18.2 
7_ 
7.4 
22.8 
24.6 
27.9 
13.4 
Mean _ 
14.13 
13. 91 
23. 90 
22.1 
28.17 
19.07 
BOLL, LINT, AND SEED CHARACTERS 
Table XI shows data on the size of bolls of the varieties grown at Sacaton 
in 1923, as computed from three 20-boll samples of each variety. The figures 
give the number of bolls necessary to make a pound of seed cotton and the 
number of bolls necessary to make a pound of lint. A count was also made to 
determine the proportion of 3-, 4-, and 5-lock bolls produced by the different 
varieties. The Pima variety produced 91.8 per cent 3-lock bolls, 8.2 per cent 
4-lock bolls, and no 5-lock bolls. Of the Upland varieties, Lone Star had 73.9 
per cent 5-lock bolls, Mebane 72, Hartsville 64.3, Acala 54.4, and Durango 
50 per cent. 
Table XI.— Size of bolls , Sacaton , Ariz., 1923 
Variety 
Number 
of bolls 
per 
pound 
of seed 
cotton 
Number 
of bolls 
per 
pound 
of lint 
cotton 
Hartsville _ 
60 
234 
Durango __ 
76 
266 
122 
451 
63 
200 
Mebane _ _ _ _ 
56 
167 
T.nnp. Star _ _ _ ___ ____ 
50 
144 
Table XII shows the variation which occurred in the lint percentage, lint 
index, and seed index for the different pickings. These figures are means of 20 
representative samples from each picking. With all varieties except Hartsville 
the lowest lint percentage was obtained in the last picking. These figures show 
a tendency for both the lint index and the seed index to become lower toward the 
end of the season. 
From Tables XI and XII it appears that Lone Star had larger bolls as well 
as a higher lint percentage and a higher lint index than any other variety, while 
the Pima had the smallest bolls and the lowest lint index. The largest seeds and 
the lowest percentage of lint were in Hartsville. 
