THE MACADAM LA NUT IN HAW A I I 
21 
Table 12. 
NtU characteristics of 10 smooth -shell-type seedling trees at Kohohi, 
Hawaii, 1933-34 harvest 
tionof 
Average 
weight 
per 
kernel 
Percentage of kernels having a grade and 
specific gravity of— 
Tree No. 
un^helled 
>J. 10 cm 
p 
tion of 
kernel 
Grade 1 
(lr;i<1p 9 
Quality 
ratio 
in H i n m - 
eter 
< 0.985 
0.US5 
1.000 
1.000- 
1.025 
^> 1 .025 
Percent 
92 
Pi TCi lit 
32. 3 
Gram* 
2.or> 
Percent 
9 
Percent 
7 
Peroral 

Percent 
3 

3.47 
100 
27.3 
2.29 
95 
4 
1 
3. 94 
i 
100 
28. 2 
2.57 
96 
4 

3. 70 
4 
90 
24. 9 
2.73 
86 
f» 
8 
5.58 
6 
100 
33. 
3. 07 
98 
2 

3.09 
6 
100 
31.8 
2. '■><) 
100 


3. 15 
7 
94 
30.9 
2. 38 
86 
4.05 
8 
100 
31.3 
2 18 
84 
10 

3.99 
9 
100 
18.3 
2.51 
83 
6 
11 
fi. 58 
10 
100 
35. 7 
2. 18 
VI 
2 
«.i 
3. 15 
All tiers are acceptable us to size of nut with a somewhat higher 
average weight per kernel than found in other orchards. The pro- 
portion of grade 1 kernels is also good. 'Frees f> and (> are exceptional 
in that they have unusually large kernels, 100-percent sizable nuts, 
and at the same time a relatively high percentage of kernels. This, 
together with very high proportion of grade 1 kernels, results in tin 1 
low quality ratios of 3.00 and 3.15. 
CORK ELATION <>1 Ql VLI'IA <>t KKKNKL. WKMiHT OF I N SHELLED NUT AND KERNEL 
\m> PERCENT OF KERNEL 
A statistical examination was made 4 of the data secured from nuts 
of individual trees of the smooth-shell type grown at Xutridge, Oahu 
(table 10), to determine the correlation between the different nut 
characteristics. The results given in table 13 are based on 139 indi- 
vidual samples of nuts. 
Table 13. Correlation of quality of kernel, neigh t of ufisfieued nut and kernel, and 
percent ktrm I 
Variables 
Coefficient 
of correla- 
tion (r) 
Quality of kernel I 
Do 
Do 
Weight of unshelled nut . 
Do 
Percent of kernel 
Weigh! of unshelled nut 
Weight of kernel 
Percent of kernel 
Weight of kernel 
Percent of kernel 
Weight of kernel 
-0.02 
+.02 
+. 18 
+.68 
-.58 
.01 
> Percent of kernels which are grade 1 (i. e., with a specific gravity less than unity). 
From table 13 it may be concluded that (1) quality cannot be 
improved by selection for weight of nut or of kernel or of percent 
kernel; and (2) weight of kernel can be increased by selection for 
weight of nut but in so doing the percent of kernel drops off. 
DISCUSSION 
Investigations by the Hawaii Experiment Station show the great 
variation in nut characteristics among the several thousand bearing 
macadamia seedlings throughout the Territory. Within a single or- 
chard of the same type, the percent kernel may vary from 20 to 40 
