EDIBLE CANNA IN WAIMEA DISTRICT OF HAWAII 
37 
In order to approximate the quantity of the various constituents 
of the rootstock lost during manufacture and the proportion retained 
by the pulp, the analysis of the pulp (Table 14) was recalculated to 
percentages of the original rootstocks. In this recalculation the 
values for the pulp were multiplied by the factor 0.58/2.388, the 
numerator being the fiber content of the rootstock and the denomi- 
nator representing that of the pulp, it being assumed that the fiber 
was not affected by the washing process. Table 15 shows what con- 
stituents are retained by the canna pulp during the process of manu- 
facture. 
Table 15. — Constituents of canna rootstocks retained by the pulp during the process 
of manufacture 
Constituent 
Rootstock 
Pulp 
Proportion 
in pulp of 
original 
rootstock i 
Proportion 
in pulp of 
constitu- 
ents of root- 
stocks » 
Moisture 
Per cent 
77.284 
.081 
.671 
.682 
20.260 
1.122 
.024 
.147 
.313 
Per cent 
77.284 
.076 
.486 
2.388 
19. 173 
.593 
.067 
.154 
.192 
Per cent 
Per cent 
Fat 
Protein. 
Fiber 
Nitrogen-free extract 
0.019 
.119 
.582 
4.672 
.145 
.016 
.037 
.047 
23.5 
18.0 
100.0 
23.1 
Total ash 
12.9 
Lime (CaO). 
66.7 
Phosphoric acid (PjOs) 
25.2 
Potash (KjO) 
15.0 
» Column 3 times factor 0.58/2.388. 
1 Column 4 divided by column 2. 
Table 15 shows that the proportions of the various constituents 
retained by the pulp are, with the exception of that of lime, very 
small. 5 Potash is leached out to the greatest extent, followed by 
protein, carbohydrates, fat, and phosphoric acid, in the order named. 
Lime is outstanding in that it is retained in the pulp to more than 
twice the extent of any of the other constituents. The predominance 
of lime in the stems (Table 14) suggests that it is contained largely 
in the more fibrous tissue of the rootstock and hence is less subject 
to leaching than are the other constituents. 
Table 16 shows the pounds per acre of fertilizer elements contained 
in one crop of edible canna. The composition and weights of the 
tops and rootstocks are based on the harvest of the five hills used in 
the analysis given in Table 14. The " proportion in pulp of original 
rootstocks" (Table 15, column 4) is used in estimating the values for 
the pulp. 
Table 16. — Fertilizer elements in one crop of edible canna from 1 acre 
Part of plant 
Weight 
per hill 
Weight 
per acre 
Nitrogen 
Lime 
Phos- 
phoric 
acid 
Potash 
Tops: 
Group 1 
Pounds 
5.2 
26.8 
4.6 
Tons 
7.1 
36.4 
6.3 
Pounds 
19.6 
76.5 
17.4 
Pounds 
46.9 
82.3 
11.3 
Pounds 
18.6 
69.2 
11.1 
Pounds 
41.7 
Group 2 
219.9 
Group 3a„ 
51.4 
Total 
36.6 
22.4 
49.8 
30.0 
113.5 
64.2 
140.5 
14.4 
98.9 
88.2 
313.0 
Rootstocks 
187.8 
Whole plant 
59.0 
79.8 
177.7 
11.5 
154.9 
9.6 
187.1 
22.2 
500.8 
Pulp 
28.2 
» Based on the assumption that the fiber was lOOjper cent retained. 
