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The widespread deficiency of magnesium in coconut acts as a limiting factor to increased production. Two ongoing experiments on potassium-magnesium (K-Mg) interaction in coconut conducted in lateritic gravels (ultisols), in the wet and intermediate agroclimatic zones of Sri Lanka showed significant yield responses (P=0.01) to differential K treatments, in the wet zone, but not in the intermediate zone. Differential Mg treatments, however, did not give rise to yield responses. Leaf and nut waterdoi:10.4038/cocos.v8i0.2066 fatcat:ausbnfugdnd5thhjpgkq4h4cbq