Two experiments were conducted using the broiler chick to determine the nutritive value of tapioca root meal in balanced chick rations. The results obtained were summarized as follows: 1. Crude protein and fat contents of tapioca root meal were very low as the value 2.40 and 0.35 percent respectively, on the other hand NFE content (81.24%) and ME value 3.430 ㎉/gm) were observed vary high. 2. When the ration was balanced with respect to protein and amino acids, tapioca root meal, at a level of 20 percent of the broiler chick ration, satisfactorily replaced corn. 3. Supplementation of the high tapioca ration (40%) with 0.15-0.30 percent of methionine and/or 0.10-0.25 percent of Na₂SO₄ largely promoted the growth of broiler. This effects are likely shown that sulfur is involved in cyanide detoxication of tapioca root meal with the formation of thiocyanates and this could have put a greater demand on methionine or Na₂SO₄ to provide sulfur for detoxication of the cyanide.