BULLETIN 52, HAWAII EXPERIMENT STATION. 
Table 1. — Composition of manganiferous and normal soils of Oahu. 
Constituents. 
Insoluble matter 
Potash (KaO) .: 
Soda(Na 2 0) 
Lime (CaO) 
Magnesia (MgO) 
Manganese oxid (Mn(304)-. 
Ferric oxid (Fe203) 
Alumina (AI2O3) 
Phosphorus pentoxid (P2O5) 
Sulphur trioxid (SO3) 
Titanic dioxid (Ti02) 
Loss on ignition 
Total 
Nitrogen (N) 
Manganiferous soils. 
Soil. 
No. 
P.ct. 
33. 46 
.83 
.40 
1.39 
.55 
9.74 
19.65 
15.50 
.21 
.16 
.73 
17.73 
100. 35 
.39 
Sub- 
soil. 
No. 
10. 
P. ct. 
36.06 
.74 
.42 
.86 
.43 
8.76 
21.51 
15.74 
.16 
.09 
1.09 
14.45 
100.31 
.23 
Soil. 
No. 
11. 
P.ct. 
39.02 
.78 
.36 
.64 
.41 
4.80 
18.24 
15.40 
.36 
.23 
.40 
19.71 
Sub- 
soil. 
No. 
12. 
P.ct. 
42.60 
.81 
.44 
.60 
.39 
3.50 
20. 52 
16.89 
.13 
.05 
.58 
13. 72 
100.35 1 100. 23 
. 45 ! . 19 
Soil. 
No. 
15. 
P. ct. 
33.73 
.99 
.21 
.49 
.52 
4.01 
26.03 
15. 82 
.35 
.17 
.85 
16.68 
). 85 
.35 
Sub- 
soil. 
No. 
16. 
P. ct. 
34.53 
1.07 
.38 
.37 
.41 
2.43 
26.85 
18.98 
.21 
.05 
1.58 
12.83 
Soil. 
No. 
27. 
P.ct. 
42.08 
.65 
.32 
.19 
.35 
4.14 
22. 05 
16.01 
.13 
.37 
0) 
14.02 
99.69 : 100. 31 
.20 .27 
ton Soil - 
No" No. 
28. 5L 
P.ct. 
42.78 
.64 
.37 
.21 
.28 
3.59 
21.36 
19.51 
.11 
.30 
(■) 
11.31 
P.ct. 
38.78 
.83 
.34 
.24 
.64 
4.32- 
20.40 
19. 35 
.11 
.29 
0) 
15. 29 
100.46 100.59 
:24 
Sub- 
soil. 
No. 
52. 
P.ct. 
39.74 
.76 
.47 
.26 
.49 
4.24 
25. 38 
16.14 
.14 
.28 
0) 
12.45 
100.35 
.13 
Constituents. 
Insoluble matter 
Potash (K2O) . 
Soda (Na 2 0) 
Lime (CaO) 
Magnesia (MgO) 
Manganese oxid (MmO-i).-- 
Ferric oxid (Fe203) 
Alumina (AI2O3) 
Phosphorus pentoxid (P2O5) 
Sulphur trioxid (SO3)- 
Titanic dioxid (Ti0 2 ) 
Loss on ignition 
Total.. 
Nitrogen (N) 
Normal soils. 
Soil. 
No. 
7. 
Sub- 
soil. 
No. 
P.ct. 
40.89 
.51 
.21 
.51 
.37 
.22 
35.72 
3.58 
.07 
.09 
3.83 
14.22 
100. 22 
P.ct. 
39.25 
33.28 
.07 
2.74 
13.99 
100. 09 
.25 
Soil. 
No. 
13. 
Sub- 
soil. 
No. 
14. 
P. ct. \ 
46. 52 
.50 
.31 
.32 
.40 
.33 
24.37 
9.15 
.09 
.11 
2.20 
15.98 
P. ct. 
46. 37 
.57 
.13 
.31 
.42 
.35 
24.49 
12.02 
.13 
.12 
2.05 
13. 17 
100. 28 i 100. 13 
. 38 I .25 
! 
Soil. 
No. 
31. 
Sub- 
soil. 
No. 
32. 
P. ct. 
41.73 
.53 
.20 
.22 
.36 
.22 
23.29 
16.02 
.08 
.46 
0) 
17.22 
100.33 
.29 
P.ct. 
37.16 
.57 
.37 
.15 
.30 
.39 
24.13 
20.87 
.12 
.33 
0) 
16.38 
100.77 
.20 
Soil. 
No. 
49. 
P.ct. 
42.36 
.65 
.46 
.23 
.47 
1.17 
20.36 
20.37 
.10 
.23 
0) 
13.22 
99.62 
.27 
Sub- 
soil. 
No. 
50. 
P.ct. 
39.82 
.48 
.20 
.12 
.44 
.36 
25. 87 
19.42 
.10 
.42 
(>) 
13.33 
100.56 
.14 
Soil. 
No. 
19. 
P. ct. 
44.00 
.59 
.?9 
.24 
.42 
.16 
27.94 
11.91 
.04 
.11 
.28 
13.95 
99.93 
.29 
1 Titanium was not separated from alumina. 
These analyses show that the manganiferous soils are well supplied 
with nitrogen, phosphoric acid, and potash, usually considered the 
three most important plant foods, and that they even surpass the 
normal soils in their supply of these constituents. Kelley showed 
that the black soils are superior to the average soils in physical 
properties, and that nitrification, one of the principal bacteriological 
factors affecting soil fertility, takes place more rapidly in the man- 
ganiferous soils than in the nonmanganiferous soils. Comparative 
solubilities in water and dilute organic acids showed little differences 
except in the much greater quantities of the manganese which were 
dissolved from the black soils. 
Table 2 gives some analyses of soils on which yellowing of pine- 
apples occurred. 
