Soil pH ·
Cation Exchange
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.com · clay colloid · exchangeable acidity · leaching
Ideal
pH 6.5
Toxic below
pH 5.5 (Al³⁺)
phase
—
H⁺ ion
Al³⁺ ion
Ca²⁺ base
K⁺ base
Clay/humus colloid
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.com · Soil pH Chemistry