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A Comparison of Strategies for Ameliorating Subsoil Acidity

II. Long-Term Soil Effects

^a 27 Drew Ave., Howick 3290, South Africa
^b KwaZulu-Natal Dep. of Agric., Cedara College, Private Bag X9059, Pietermaritzburg 3200, South Africa

View larger version (55K): [in a new window]   Fig. 1 Temporal effects of gypsum on exchangeable Ca and Mg, acidity, and exchangeable and extractable SO4–S (values denote the difference between treatments receiving lime and gypsum and those receiving lime only)

View larger version (34K): [in a new window]   Fig. 2 Temporal effects of gypsum on percent acid saturation, pH in water, pH in 1 M KCl, and the differential between pHw and pHs (values denote the difference between treatments receiving lime and gypsum and those receiving lime only). Refer to Fig. 1 for legend