EVALUATION OF VARIOUS SOIL TESTS FOR AVAILABLE MAGNESIUM IN WESTERN NIGERIA

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Abstract
Ten soil test procedures for available Mg were evaluated for their ability to predict the available Mg status of some Nigerian soils. All the methods extracted essentially the exchangeable Mg and would, in general, be fairly satisfactoy for the soils studied. Correlation and regression analyses showed that N neutral NH4OAc [ammonium acetate] and NaOAc [sodium acetate] (pH 4.8) were slightly better extractants for predicting Mg uptake by maize (Zea mays L.) These 2 extractants are recommended for routine analysis on soils similar to the ones studied. The convenience and speed of extraction with the N neutral NH4OAc (1 h shaking) render this technique preferable to the conventional leaching procedure. The choice between N NH4OAc and Morgan''s reagent (NaOAc/HOAc, pH 4.8) will depend on the particular circumstance, the laboratory facilities available and the needs and preferences of the analyst.

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