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Fourteen organic materials were collected from five coconut growing areas in Sri Lanka viz. Chilaw, Gampaha, Negombo, Kurunegala, and Kalutara. They were cattle manure, goat manure, broiler and layer poultry manure, pig manure, farm yard manure (FYM), biogas residue, sewage sludge, compost, gliricidia, pueraria, calopagonium, and acacia. Their total N, P, K, Ca, Mg, Na, Fe, Mn, Cu, Zn, B, Cd, NH4-N, N03 -N and organic carbon (OC) contents were determined. The plant materials and animal manures contain appreciable quantities of plant nutrients. Nutrient content of each organic material was found to be variable depending on the origin and location. Goat manure and fresh foliage of gliricidia had a higher content of N, than the other materials. The N content was higher in broiler than in layer litter. Sewage sludge had the lowest N content. Highest P content was in poultry manure, while K content was highest in green materials. Magnesium content was higher in FYM and biogas residue. The materials tested have considerable amounts of macro and micro nutrients and these materials could be used as a source of plant nutrients for coconut, to supply the N requirement in full and P, K and Mg requirements partially.

NUTRIENT CONTENT OF SOME LOCALLY AVAILABLE ORGANIC MATERIALS AND THEIR POTENTIAL AS ALTERNATIVE SOURCES OF NUTRIENTS FOR COCONUT