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Interaction effects of two factors on yield increases: soil exchangeable Mg and rates of Mg fertilizers (A), soil exchangeable-Mg and pH (B), soil pH and Mg fertilizer types (C). * and **, indicated significant differences at P < 0.05 and P < 0.01, respectively. MgO, magnesium oxide; Mg-R, rapidly released Mg fertilizers; Mg-S, slowly released Mg fertilizers.
