Chemical composition of rice soils — Continued. 
District. 
Alumina 
(AlsO,). 
Phos- 
phorio 
acid 
(PsO»). 
Sulphur 
trioxid 
(SO,). 
Titanic 
dioxid 
(TiO,). 
Los-; on 
ignition. 
OAHU. 
:ki: 
Sail 292 
Per cent. 
14.10 
13.09 
17.10 
17.42 
19.35 
14.94 
14.50 
12. :.' 
12. 45 
20. 35 
20.90 
14.92 
15. 30 
14.40 
12.42 
20. 15 
20.10 
19.12 
13.60 
20.30 
19.95 
16.95 
20.35 
Percent. 
o. as 
.71 
.32 
.26 
.45 
.76 
.68 
.29 
.22 
.20 
.23 
.21 
.23 
.19 
.13 
.44 
.52 
.53 
.35 
.51 
. 72 
.31 
.56 
Percent. 
0.0S 
.11 
.03 
.10 
.23 
.26 
.26 
.20 
.20 
.04 
.04 
.20 
.13 
.31 
.80 
.27 
.28 
.35 
.30 
.28 
.31 
.26 
.21 
Per cent. 
2.17 
2.64 
2.26 
2. 17 
1 . 53 
2. 43 
2. 1 : 
2. 92 
2.81 
2.24 
2. 37 
1.64 
1.60 
2.28 
1.90 
2.78 
3.00 
2.67 
2.06 
2.93 
2.27 
2.57 
2.70 
Percent 
9.10 
9. 92 
13.96 
13.58 
13.70 
18.63 
18.43 
21.10 
18.41 
13.85 
12. 30 
13. 22 
14.70 
34.52 
46.70 
14.15 
14.35 
12. 25 
10.42 
12. 95 
11.27 
11.80 
13. 35 
Per cent. 
100. 78 
100.02 
100. 13 
100.32 
98.94 
100.24 
100.58 
99.76 
100.94 
100.92 
100.99 
100.42 
100.31 
100.39 
100.59 
101.60 
101.07 
100. 43 
101.17 
100.30 
101.10 
101. 35 
Ptr cent. 
(>. HI 
Subsoil 293 
.16 
Fort Shaffer: 
- : m 
. It; 
-oil 333 
. 13 
Soil 334 
Kailua: 
. 23 
.44 

Subsoil 33S 
. 42 
Soil 339 
.41 
Subsoil 340 
.30 
Kaneohe: 
Soil 313 
.20 
Subsoil 344 
. 17 
Waiahole: 
Soil 345 
.21 
Sub-oil 346 
.20 
Kalaunui: 
Soil 347 
1.24 
Subsoil 348 
1.44 
KAUAI. 
Hanalei Vallev: 
Soil 460..." 
.26 
Soil 461 
.24 
Soil 462 
.20 
Soil 463 
. Is 
Soil 464 
.20 
Soil 465 
.15 
Soil 466 
.17 
Soil 467 
.17 
It will at once be seen that these soils differ from normal soils not 
only in physical properties but also in chemical composition. 
The lavas from which these soils have been derived are made up 
primarily of pyroxenes or amphiboles and soda-lime feldspars, and 
therefore are characteristically basic. In the disintegration process 
solution and oxidation play the most important part-, with the result 
that the soils formed contain iron and aluminum in great quantities, 
while the potash, soda, lime, and magnesia are largely leached 
out as silicates. In a few instances the rice soils, however, contain 
relatively large amounts of lime and magnesia, due partly to admix- 
tures with coral limestone and in part to the type of lava from which 
they were derived. It is also noteworthy that the ratio of lime to 
magnesia in these soils is abnormal, the latter sometimes being pres- 
ent in great excess above the former. In view of the interest now 
taken in the lime-magnesia ratio the relations of these tw< elements 
are of special interest, particularly since rice has been extensively 
studied in connection with this ratio. 
The potash content is rather low, while phosphoric acid us generally 
present in large amounts. From a superficial examination of these 
analyses it would seem that potash fertilization is needed. It will be 
shown in connection with the fertilizatic n studies, however, that there 
