20 
BULLETIN 79, HAWAII EXPERIMENT STATION 
WAIPAHU, OAHU 
Twelve trees were selected at random to determine the extent of 
variation in the Waipahu orchard. The orchard was about 8 years 
old. The location is at sea level and dry, the trees being irrigated 
when necessary. Each result is the average of five to seven samples 
taken throughout the bearing season. These trees are the same as in 
table 7. The results are given in table 11. 
Table 11. — Yield and nut characteristics of 12 smooth-shell-type seedling trees at 
Waipahu, Oahu, 1930-31 crop 
Tree No. 1 
Total 
yield 
of un- 
shelled 
nuts 
Propor- 
tion of 
kernel 
Aver- 
age 
weight 
per 
kernel 
Percentage of kernels having a grade and 
specific gravity of— 
Quality 
ratio 
Yield 
of 
grade 1 
ker- 
nels 1 
Grade 1 
Grades 
2 and 3 
<0.970 
0. 970- 
0.985 
0.985- 
1.000 
Total 
grade 
>1.000 
Pounds 
Percent 
Grams 
Percent 
Percent 
Percent 
Percent 
Percent 
Pounds 
1 
65. 1 
32. 4 
2. 02 
9 
61 
21 
91 
9 
3. 42 
19. 1 
2 
48. 1 
33. 3 
1. 72 
14 
63 
14 
91 
9 
3. 33 
14.5 
3 
57.4 
31. 5 
2. 02 
8 
84 
■ 7 
98 
2 
3. 24 
17. 7 
4 
55.9 
28. 5 
1.87 
13 
71 
14 
96 
4 
3. 65 
15.3 
5..... 
43. 1 
22. 9 
1. 85 
8 
58 
29 
94 
6 
4. 64 
9.3 
6 
43.8 
28. 5 
1. 87 
2 
62 
27 
90 
10 
3.91 
11.2 
7 
53. 5 
24. 3 
2. 00 
9 
67 
17 
93 
4. 38 
12. 2 
8 
66. 6 
28.8 
2. 24 
13 
79 
5 
97 
3 
3. 58 
18.6 
9 
36. 2 
20.9 
2. 41 
6 
58 
24 
88 
12 
5. 43 
6.7 
10 
54. 6 
40. 7 
1. 91 
41 
58 

99 
1 
2. 48 
22.0 
11 
52. 1 
31.8 
2. 23 
20 
67 
8 
96 
4 
3.28 
15.9 
12 
47.6 
30. 1 
1.86 
21 
64 
12 
96 
4 
3. 46 
13.8 
1 Same trees as in table 7. 
2 Total yield of unshelled nuts divided by quality ratio. No sizing of unshelled nuts was done during this 
time. 
As noted in table 1 1 the proportion of kernels which are grade 1 is 
uniformly high. All trees but one bore 90 percent or more of grade 1 
kernels. The variation in proportion of kernel is from 20.9 to 40.7 
percent. The variation in yield of grade 1 kernels per tree of from 
6.7 to 22 pounds is indicative of the possibilities for improvement of an 
orchard through elimination or top working of undesirable trees. 
KOHALA, HAWAII 
The trees in the Kohala orchard were 8 to 12 years old at the time 
of this test. The elevation is 400 feet above sea level and the rainfall 
about 40 inches. Only one sample was taken from each tree during 
the period of greatest nut drop. Results are given in table 12. 
