Thomas Varghese, P.Gopalasundaram, P.Nelliat, E.V.Rama VarmaNair, P.K.R.2014-06-302014-06-302007-02In: Proceedings, PLACROSYM I, RRII, Kottayam, 20-23 Mar. 1978. Edited by E. V. Nelliat and others 1979 p-399-415http://hdl.handle.net/123456789/3485Intercropping in coconut stands with tubers revealed that raising tuber crops has no adverse effect on the main crop of coconut, provided, the same intercrop was not grown on the same plot every year and that both the inter crop and the main crop were manured adequately and separately. A five per cent increased yield of coconut over pre-experimental yield was obtained when tapioca, elephant yam, sweet potato, ginger and turmeric were grown in rotation as intercrops and 15% increase When greater yam, lesser yam, colocasia, and Chinese potato were rotated. Tapioca, cultivar M-4 yielded 4.5 t/ha when grown continuously in the same plot as against 6.3 t/ha when it was alternated with elephant yam. Similarly, yield of elephant yam increased from 6.4 t/ha (continuous crop) to 11.8 t/ha (in rotation with tapioca). Further improvement in the yield of these crops was noticed in five year rotations. Among the intercrops, elephant yam and ginger were the most profitable. Besides giving higher net returns per unit area, intercrops generated additional employment to the tune of about 130 man days/ha/year.enArticle