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CH3041
ON-LINE LECTURE 12
SOIL CHEMISTRY
• At the Earth’s surface the soil is a thin layer composed of weathered inorganic minerals
(»
95%) and organic matter (»
5%).
• A soil has three phases: (>50% solid)
solid
particles (inorganic, organic)
gas (air spaces, local pgas)
liquid (soil water, local [ion])
water sorbed on soil air space
soil particle soil saturated with water
• The porous
medium is a
result of both physical and biological
processing of the mineral & organic inputs.
medium is a
result of both physical and biological
processing of the mineral & organic inputs.
• Soil pH 1:5
vol Soil:CaCl2 (0.01M) paste.
<4 strongly acidic, >10 strongly alkaline
<4 strongly acidic, >10 strongly alkaline
