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Agronomic efficiency of Mg fertilizers (AE-Mg) in all crops (A), vegetables (B), tubers (C), fruits (D), cereals (E), and other crops (tobacco, tea, grasses, oil, and other crops) (F). The data points were means ± 95% CI (confidence interval), and the number of experimental observations were indicated in parentheses. MgO, magnesium oxide.
