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

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Abstract
The quantity-intensity parameters for Mg buffer capacity (BCMg) and intensity (CRMg), were determined to examine the effects of lime application and 6 New Zealand soils. Liming increased BCMg and decreased CRMg on all soils, and these changes were used and these changes were used to explain the lime-induced changes in soil-exchangeable Mg observed here and in plant Mg observed elsewhere. Liming increased the effective cation exchange capacity (ECEC) in all soils and increased the selectivity for Ca relative to Mg .**GRAPHIC**. in most soils. The proportional change in ECEC was greater than that in .**GRAPHIC**. and hence the change in BCMg due to liming was determined largely by ECEC. The practical implications of these results are discussed.

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