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Magnesium (Mg) is an element that interacts with calcium (Ca) and potassium (K). Well growth of plants must be obtained sufficient nutrients and suitable nutrient ratios. The economic crop growing soils in southern Thailand were collected to study soil Mg status, Ca: Mg and K: Mg ratios for suitable fertilizer management. The results showed that the extractable Mg contents in various tree planted soils, i.e. rubber (5.18-22.90 mg/kg), oil palm (39.69-84.65 mg/kg), longkong (17.17-28.96 mg/kg), and durian (23.22-64.82 mg/kg), were low, while those in coconut (115.97-180.16 mg/kg) and rice (392.84-671.44 mg/kg) were high. Oil palm and coconut planted soils had a high ratio of Ca: Mg, but those in rice planted soils were low. In addition, rubber tree planted soils had a high ratio of K: Mg compared with other crop planted soils. Therefore, soil with Mg extracted below 122 mg/kg requires Mg fertilizer, especially soil with high ratios of Ca: Mg and K: Mg.
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