MANGANESE CHLOROSIS OF PINEAPPLE. 
Table 2. — Analyses of manganiferous soils. 1 
Constituents. 
Soil laboratory numbers. 
635 
636 
637 
638 
639 
640 
641 
Manganese oxid (M113O4) 
Insoluble matter .. .. , 
Per cent. 
0.31 
29.43 
.21 
.83 
.39 
.43 
15. 50 
30.79 
.51 
.36 
19.76 
1.74 
Per cent. 
4.80 
39. 99 
.21 
.87 
.39 
.61 
13.23 
22.78 
.55 
.42 
15.63 
.62 
Per cent. 
5.19 
38.28 
.34 
.56 
.42 
.57 
12.26 
25. 05 
.51 
.34 
15.71 
.72 
Per cent. 
5.12 
39.28 
.33 
.62 
.44 
.47 
12.27 
24.62 
.50 
.32 
15. 50 
•H 
Per cent. 
2.51 
39.79 
.38 
.92 
.35 
.43 
10.42 
25.70 
.56 
.48 
18.06 
.73 
Per cent. 
5.58 
38.08 
.40 
.65 
.43 
.40 
10.95 
25.33 
.61 
.31 
16.89 
.53 
Per cent. 
2.85 
39.63 
Potash (K2O) 
.34 
Soda (NaaO) 
Lime (CaO) 
.60 
.36 
Magnesia fllgO) . 
.51 
Ferric oxid (Fe203) . 
13.44 
Alumina (AI2O3) 
23.37 
Phosphorus pent oxid (P2O5) 
Sulphur trioxid (SO3)--- - 
.53 
.36 
Volatile matter 
17.23 
Titanic dioxid (TiO) . 
.83 
1 These soils will be referred to later in the text. 
These analyses are similar to those of Keller in that they show 
a high content of manganese where the yellowing occurred, with the 
exception of soil No. 635, which was obtained from Kunia, Oahu. 
The plants on this soil were yellow and produced characteristic red 
fruit. This soil, according to the analysis, contained only 0.31 per 
cent of manganese calculated as the mangano-manganic oxid. That 
this manganese is actually present as the dioxid will be shown, while 
the manganese in normal soils is probably in the silicate form. 
FORM IN WHICH MANGANESE OCCURS IN THE SOIL. 
Kelley, in his analyses, reported the manganese calculated as the 
mangano-manganic oxid (Mn 3 4 ), but concluded from his investiga- 
tions that at least part of the manganese is present as higher oxids, 
since there is a liberation of chlorin gas with acids and a change in 
appearance during ignition. 
To determine the form in which manganese was present in the 
soil, the writer distilled the samples according to the Bunsen method 
for available oxygen in pyrolusite. Table 3 compares the manganese 
dioxid, calculated from these results, with the total manganese pres- 
ent, calculated to the same form. 
Table 3. — Comparison of total manganese with manganese dioxid in the manganif- 
erous soils. 
Laboratory soil number. 
Total 
manganese 
dioxid by 
official 
method. 
Manganese 
dioxid 
according to 
the Bunsen 
distillation 
method. 
Laboratory soil number. 
Total Manganese 
official the Bunsen 
mShod d^tmation 
method. ( method 
635 
Per cent. 
0.35 
5.48 
5.92 
5.86 
Per cent. 
0.35 
4.85 
5.20 
5.15 
639 
Per cent. Per cent. 
2. 86 ', 2. 66 
636 
640 
6 36 K fi7 
637 
641 
3.25 
1.92 
638 
Since the distillation method probably gives low results owing to 
the presence of organic matter, it is safe to conclude that nearly all 
the manganese present is in the form of dioxid. This assumption is 
86067— 24f 2 
