10 
BULLETIN 56, HAWAII EXPERIMENT STATION 
Table 4. — Relation of the specific gravity of rootstocks, as shown by stage of 
maturity, to their starch content and other constituents 
HILL A (12 MONTHS OLD), STATION FIELD 26A 
6 
Genera- 
tion 
Stage of maturity 
Moisture 
Dry mat- 
ter 
Starch in 
Solids 
other 
than 
starch . 
Specific 
gravity 
E 
eS 
Green 
weight 
Dry 
weight 
1 
Group 1... 
Per cent 
55.30 
70.72 
73.91 
82.70 
84.58 
Per cent 
44.70 
29.28 
26.09 
17.30 
15.42 
Per cent 
21.30 
22.53 
Per cent 
70.03 
76. 93 
Per cent 
13.40 
6.75 
6.17 
6.18 
6.46 
1.056 
? 
Old Group 2 
1. 106 
3 
Old Group 3a 
19.92 1 76.36 
11. 12 64. 30 
8.96 58.11 
1.094 
4 
Young Group 3a 
1.033 
5 
Group 3b (spike) 
1.012 
HILL B (7 l A MONTHS OLD), STATION FIELD 26B 
10 
First... 
Second 
Third- 
Fourth 
Fifth .. 
Old Group 2 . 
Medium Group 2 .. 
Young Group 3a.. 
Medium Group 3a . 
Young Group 3a... 
70.15 
29.85 
17.49 
58.58 
12.36 
63.90 
36.10 
28.81 
79.81 
7.29 
68.22 
31.78 
22.83 
71.83 
8.95 
79.46 
20.54 
15.18 
73.89 
5.36 
86.40 
13.60 
9.47 
69.64 
4.13 
1.073 
1.104 
1.089 
1.054 
1.032 
HILL C (3M MONTHS OLD), STATION FIELD 32C 
11 
First.... 
Second . 
Third .. 
Fourth . 
...do.... 
Medium Group 2 
80.52 
85.52 
87.42 
90.42 
91.92 
19.48 
14.48 
12.58 
9.58 
8.08 
11.51 
7.75 
7.20 
4.59 
2.58 
59.08 
53.54 
57.20 
47.91 
31.87 
7.97 
6.73 
5.58 
4.99 
5.50 
1.034 
n 
Young Group 2 
1.000 
13 
14 
Medium Group 3a 
Young Group 3a 
.977 
.974 
15 
Group 3b (spike) 
.971 
HILL S (11 MONTHS OLD), WAIMEA FIELD S 
16 
First 
17 
Second . 
18 
Third... 
19 
Fourth . 
20 
...do.... 
21 
...do.... 
22 
Fifth ... ! 
?3 
?4 
1 
Group 1 
Old Group 2 
Medium Group 2 
Young Group 3a (old) .. 
....do . 
....do 
Spike, dead 
Young Group 3a (fresh) 
do 
65.23 
34.77 
27.42 
78.85 
7.35 
65.25 
34.75 
27.92 
80.35 
6.83 
70.47 
29.53 
24.41 
82.65 
5.12 
85.71 
14.29 
9.42 
65.94 
4.87 
85.86 
14.14 
9.83 
69.52 
^.31 
80.17 
19.83 
13.60 
68.58 
6.23 
75.20 
24.80 
18.59 
74.96 
6.21 
90.68 
9.32 
4.51 
48.37 
4.81 
92.79 
7.21 
2.08 
28.85 
5.13 
1.097 
1.115 
1.104 
1.021 
1.027 
1.051 
1.076 
.972 
A distinct correlation between specific gravity and starch and other 
constituents is apparent. Certain discrepancies exist, particularly 
with respect to the first generation rootstocks, which were characterized 
by unusually high solids other than starch. In the older hills the specific 
gravities of such rootstocks were less than of second generation root- 
stocks, and bore slight relation to the percentages of starch. As pre- 
viously stated (p. 2), this kind of rootstock is materially different in 
manner of growth from the other rootstocks in the hill, and since 
only one or two grow in each hill, they may be disregraded in con- 
sidering the hill as a whole. Although the solids other than starch 
did not vary widely, they showed a distinct tendency to follow the 
specific gravity curve. The relationship between these several con- 
stituents is evident, particularly in case of hill S (fig. 13), 5 in which 
the percentages dropped suddenly in the fourth generation, increased 
in the fifth, and dropped again in the sixth generation. 
5 The first generation of each hill is omitted from figs. 13 and 14. 
