BULLETIN 79, HAWAII EXPERIMENT STATION 
Table 6. — Scoring of factory shipments of rough-shell-type macadamia nuts from 
Kona, Hawaii, 1935-36 
Shipment No. 
Date received 
at Honolulu 
Weight 
of un- 
shelled 
nuts 
Propor- 
tion of 
kernel 
Percentage of kernels having 
a grade and specific gravity 
of— 
Quality 
ratio 
Grade 1 
kernels 
Grade 1 
« 1.000) 
Grade 2 
(1.000- 
1.025) 
Grade 3 
(> 1.025) 
1 
2 
Dec. 1935 
Feb. 17,1936 
Mar. 7,1936 
Mar. 17, 1936 
Mar. 26, 1936 
May 7, 1936 
May 25, 1936 
Pounds 
136 
~"~295~ 
808 
1,228 
695 
418 
Percent 
21.7 
24.0 
26.4 
25.5 
24.6 
23.5 
27.0 
Percent 
27.9 
44.5 
53.4 
70.8 
65.5 
79.9 
84.9 
Percent 
38.2 
40. 1 
33.7 
23.5 
23.9 
16.2 
12.7 
Percent 
33.9 
15.4 
12.9 
5.7 
10.6 
3.9 
2.4 
16. 54 
9. 35 
7. 09 
5. 54 
6. 22 
5. 32 
4.35 
Pounds 
8.2 
3 
4 
5 
6 
7 
41.7 
146. 1 
197.4 
130.6 
97.0 
Table 6 shows an extremely poor quality of kernels in the early 
part of the season, with only 27.9 percent grade 1. Improvement 
in quality is rapid as the season advances, the last shipment having 
the highest value of 84.9 percent. The bulk of the crop was contained 
in the fourth, fifth, and sixth shipments, in which the proportion of 
grade 1 kernels was 65.5 to 79.9 percent. This is much below the 
standard of the smooth-shell types. As has been noted, the rough- 
shell type has other undesirable features as a commercial nut, such as 
poor color, variable flavor, and undesirable tree characteristics. 
EVALUATION OF NUTS FROM DIFFERENT SEEDLING TREES FROM 
DIFFERENT LOCALITIES 
The bearing trees of macadamia are made up of miscellaneous old 
trees found in many locations throughout the Territory and a number 
of commercial orchards, many of which are just coming into bearing. 
All trees are seedlings. The origin of the seed used in the various 
plantings is seldom known even in the younger commercial orchards. 
It requires only casual inspection to note the great variations among 
the trees in any one orchard. These variations are manifest not 
only in vegetative characteristics but also in fruiting habits, such as 
total yields, distribution of the harvest throughout the year, and 
the various factors of nut quality. 
VARIABLE FACTORS 
DISTRIBUTION OF THE CROP THROUGHOUT THE BEARING SEASON 
Nuts were collected throughout the bearing season from a series of 
12 seedling trees at Waipahu, Oahu, to determine the variations 
in the drop of nuts throughout the year. The results are given in 
table 7. 
