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THE EFFECTS OF LIME ON THE MAGNESIUM STATUS AND EQUILIBRIA IN SOME NEW ZEALAND TOPSOILS

The quantity-intensity parameters for magnesium buffer capacity (BCMg) and intensity (CRMg), were determined to examine the effects of lime application on six New Zealand soils. Liming increased BCMg and decreased CRMg on all soils, and these changes were used to explain the lime-induced changes in soil-exchangeable magnesium observed here and in plant magnesium observed elsewhere. Liming increased the effective cation exchange capacity (ECEC) in all soils and increased the selectivity for calcium relative to magnesium (KCasMg) in most soils. Nevertheless, the proportional change in ECEC was greater than that in KCasMg, and hence the change in BCMg due to liming was determined largely by ECEC. The practical implications of these results are discussed.