Among the tropical tuber crops, elephant foot yam (EFY) (Amorphophallus paeoniifolius (Dennst.) Nicolson) is a highly potential and ideal intercrop for the coconut gardens of Kerala. Being a high nutrient demanding crop, for efficient fertilizer management, we have developed a customized fertilizer mixture containing primary, secondary and micronutrients based on soil nutrient status and crop requirement. This paper narrates the protocols designed for the development of the customized

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... mixture which in turn consisted of arriving at the weighted average of the nutrient status of the two AEU's, nutrient omission/nutrient level experiments off station and arriving at some basic parameters to arrive at the fertilizer grades.