Within 6 months of basalt application, pH had increased significantly (Table
3). The increase in pH resulted in the reduction of exchangeable Al. As the soil
contained variable charge minerals, the increase in pH resulted in an increase in
CEC. The CEC increase may also be due to the lowering of pHo as the reaction
of silicate in soils is known to lower pHo (Uehara and Gillman 1981). The term
pHo is the pH at which net charge on the surface of variable charge colloids
is zero. Cation Exchange capacity is dependent on the difference between soil
pH and pHo. When pHo is decreased, the difference is widened causing CEC to
increase. The dissolution of basalt released Ca, Mg, K and P into the soil, causing
exchangeable Ca, Mg and K, and available P to increase significantly. This means
that acid soil infertility can be somewhat ameliorated by basalt application.
Within 6 months of basalt application, pH had increased significantly (Table
3). The increase in pH resulted in the reduction of exchangeable Al. As the soil
contained variable charge minerals, the increase in pH resulted in an increase in
CEC. The CEC increase may also be due to the lowering of pHo as the reaction
of silicate in soils is known to lower pHo (Uehara and Gillman 1981). The term
pHo is the pH at which net charge on the surface of variable charge colloids
is zero. Cation Exchange capacity is dependent on the difference between soil
pH and pHo. When pHo is decreased, the difference is widened causing CEC to
increase. The dissolution of basalt released Ca, Mg, K and P into the soil, causing
exchangeable Ca, Mg and K, and available P to increase significantly. This means
that acid soil infertility can be somewhat ameliorated by basalt application.
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