A general analysis of four samples of soil from Merced, California, has
given the following results:--
SAMPLE A.
Organic matter (Humus) 5.5
Soluble inorganic matter 11.75
Insoluble silica and silicates 82.75
--------
100.00
SAMPLE B.
Organic matter (Humus) 4.25
Soluble inorganic matter 14.45
Insoluble silica and silicates 81.30
--------
100.00
SAMPLE C.
Organic matter (Humus) 5.25
Soluble inorganic matter 16.75
Insoluble silica and silicates 78.00
--------
100.00
SAMPLE D.
Organic matter (Humus) 3.5
Soluble inorganic matter 12.0
Insoluble silica and silicates 84.5
--------
100.00
The organic matter is available for plant growth.
The inorganic matter, soluble in dilute hydrochloric acid, is (with the
exception of the alumina it may contain) composed of fertilising
material.
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