Determination nutrient content (C, N, P, K) on the citrus (Citrus sp.), pineapple (Ananas comosus), papaya (Carica papaya L.) peels eco-enzyme.

Ecoenzyme are solution of fermented fruit peels that can be used in green organic fertilizer. They are thought to have a concentration of nutrients that plants can absorb. The aim of this study is to determine concentration of nutrients content such as carbon, nitrogen, phosphorus, and potassium. The method used for carbon analysis is the Walkley Black method and Kjeldahls method for nitrogen analysis. Then for analysis of phosphorus, the sample was destruct with HCl then measured using UV Vis spectrophotometry. At the potassium analysis, the sample was destruct with HNO3 and HClO4 then measured using atomic absorption spectrophotometer. The carbon content obtained is 1,88%, the nitrogen content obtained is 0,04% and phosphorus and potassium content obtained is 0,02% and 1,04%. The concentration of nutrients in the ecoenzyme is below the minimum standard of 3-6%. [ABSTRACT FROM AUTHOR]