Utilization ofEudrilus eugeniaefor disposal of cassava peel

Abstract

The bitter cassava,Manihot utilissima, is widely grown in the tropics for its large tuberous roots, a major source of food carbohydrate. The rind of the roots, though rich in nutrients, has a high cyanide content and, as cassava peel, forms a toxic waste which kills soil invertebrates and can inhibit root respiration at very low cyanide (KCN) concentrations (Tanaka and Tadano, 1972). The toxicity of cassava peel limits its use as an organic manure and the peel is therefore dumped. The dumps are commonly on the most fertile land in the villages, presenting problems of soil conservation.