The response to KCl of coconuts grown in an elevated inland area with reddish brown clay loam soil was studied. Based on 16 accumulated harvests, a quadratic response to KCl in terms of nuts/tree was noted and a linear response in terms of copra weight/nut yield from 1.78 to 2.09 ha/year. Leaf analysis revealed that the limiting nutrient was chlorine and not potassium. Economic analysis revealed that higher net profits could be obtained by KCl fertilization. The findings of this study were applicable to several soil series in the country.