Abstract
Exchange reactions and dissolution of soil minerals in 0.01, 0.05 and 0.1 N NaCl solutions at three different times of contact between two soils and the solutions were studied. It was found that dissolution of soil minerals occurred continuously and the release of divalent cations from exchange sites did not stop the process. The amounts dissolved from both soils increased as the concentration of NaCl and time of contact increased. The minimum amounts of calcium and magnesium dissolved in 0.01 N NaCl during 10 min of contact between soil and solution were 0.7 and 0.9 mequiv./100 g from a noncalcareous terra rossa and a calcareous grumusol, and the maximum amounts of these cations dissolved in 0.1 N NaCl during two weeks of contact were 2.5 and 3.1 mequiv./100 g soil from the terra rossa and grumusol, respectively. The amounts released from exchange sites were proportional to the cation exchange capacities of the soils and the SAR of the soil solutions. The effects of calcium and magnesium released from dissolution of soil carbonates and aluminosilicate and from exchange sites on SAR of soil extracts were investigated.
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