152
RESULTS OF THE EXAMINATION OF SOIL FROM HONG KONG.
Imperial Institute No. M.3283.
Date: 31st May, 1929.
Reference B. Sub-soil. Chuk Shan Lung.
Description: Yellowish loam.
RESULTS OF EXAMINATION.
Preliminary mechanical analysis on the entire soil, which was air-dried before examination.
Size of particles
in mm.
Per cent.
Stones and gravel
Over 2-0
"Fine earth"
Under 2.0
Mechanical analysis of "Fine earth"
25.03
74.97.
Size of particles
in mm.
Fractions dried at 105°C.
Fractions
ignited
per cent.
per cent.
Coarse sand
2.0 to 0-2 ...
22.69
22.60
Fine sand
0·2 to 0-02
16.04
15.84
Silt
0.02 to 0·002
30.05
30.12
Clay ...
0-002 and under
28.48
25.18
Moisture at 105°C
Matter soluble in water...
Loss by solution in HC1
Calcium carbonate
Loss on ignition
Total
:
:
:
1.23
1.23
0.018
0.018
0.29
0.29
nil.
nil.
5.15
98.80
100.43
* Not including moisture at 105°C. or CO2 from carbonates.
2
[Containing sulphates equivalent to sulphuric anhydride (SO) 0.005 per cent.
(Containing chlorides equivalent to chlorine (C1)...
Reaction of soil: Very strongly acid
0.004 per cent.
pH value 4.43
(Quinhydrone method).