168
RESULTS OF THE EXAMINATION OF SOIL FROM HONG KONG.
Imperial Institute No. M.3283.
Date: 31st May, 1929.
Reference: F. Sub-soil. Tai Long Wan, Lo Kong, Shek 0; Cultivated, fair crop of padi
growing on area.
Description: Pinkish-brown loam.
RESULTS OF EXAMINATION.
Preliminary mechanical analysis on the entire soil, which was air-dried before examination.
Size of particles
in mm.
Stones and gravel
Over 2-0
"Fine earth"
Under 2-0
Mechanical analysis of "Fine earth"
Per cent.
6.87
93.13
Size of particles in mm.
Fractions dried at 105°C
Fractions ignited.
per cent.
per cent.
Coarse sand
2-0 to 0-2 ...
17.50
17.16
Fine sand...
0-2 to 0-02
24.67
24.05
Silt
0-02 to 0·002
31.80
30.87
Clay
0-002 and under.
22.35
18.98
Moisture at 105°C
Matter soluble in water ‡
Loss by solution in HC1
Calcium carbonate
Loss on ignition
*
Total
:
:
4.60
4.60
0.033
0.033
0.19
0.19
nil.
nil.
4.30
101.14
100.18
*Not including moisture at 105°C. or CO, from carbonates.
(Containing sulphates equivalent to sulphuric anhydride (SO) 0.008 per cent.
Containing chlorides equivalent to chlorine (C1)...
0.011 per cent.
Reaction of soil: Acid
pH value 5.94
(Quinhydrone method).
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