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RESULTS OF THE EXAMINATION OF SOIL FROM HONG KONG.
Imperial Institute No. M. 3283.
Date: 31st May, 1929.
Reference: E. Top-soil; Kuei Island; Cultivated; green vegetables in good condition
growing on area.
Description: Greyish sandy loam,
RESULTS OF EXAMINATION.
Chemical analysis of "Fine earth' passing a 1 mm. sieve.
Soluble in hydrochloric acid
Available constituents i.e., portion soluble in 1% citric acid solution
Exchangeable bases (Hissink method)
per cent.
per cent. lb. per acre.
per cent.
Lime
...Cao
0.34
0.257
6237
0.276
Magnesia
.MgO
0.10
0.090
2184
0.069
Potash
.K.O
0.10
0.023
558
0.028
Soda
Na2O
0.14
0.022
534
0.014
Ferric oxide
Fe2O3
2.68
0.091
*
Alumina
.A1203
0.003
6.94
0.289
Phosphoric acid
2
P2OS
0.27.
0.104
2524
Silica
...Sio,
Total
per cent.
16.
per acre.
Nitrogen
...N
0.104
2524
Organic carbon ...C
1.12
27182
Organic matter*
2.04
Carbon dioxide ...CO2
0.05
100
*Obtained by multiplying the figure for organic carbon by .
The figures for lb. per acre of the various constituents in the above table are calculated for a depth of 9 inches of soil, the apparent specific gravity of the soil being taken into consideration.
Atomic ratio
Carbon, C Nitrogen, N
=
12.6
Composition of clay fraction (0.002 mm. and under, separated by sedimentation).
per cent.
Silica Alumina
...SiO 2
43.24
Al2O3
33.07
Ferric oxide
...Fe2O
5.82
Titanium dioxide
.TiO2
0.24
Manganous oxide
MnO
0.11
Lime
...Cao
nil.
Magnesia
.MgO
0.31
Potash
.K2O
0.52
2
Soda
...Na2O
0.26...
Loss on ignition....
16.50
Phosphoric acid
...P2O,
0.35
Total
100.42
Molecular ratio
Silica,
SiO 2 Alumina, Al,0%
= 2.22.
3
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