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Effects of Mg fertilizer on crop yield under different soil conditions (exchangeable-Mg concentrations, soil pH, rates of MgO application, and types of Mg fertilizers). The data points were means ± 95% CI (confidence interval), and the number of experimental observations were indicated in parentheses. Soil ex-Mg, soil exchangeable magnesium; MgO, magnesium oxide; Mg-R, rapidly released Mg fertilizers; Mg-S, slowly released Mg fertilizers.
