TABLE 5. Nutrient content of banana leaf as influenced by the cropping systems. Experiment 3 Nutrient Content (%)_ Cropping .. Systems N P K Ca Mg' Mn (ppm) B + IT (Control) 2.59 a 0.117 a 3.68 a 0.995 a 0.327 a 1383 a B + IT + 4S 2.64 a 0.182 a 3.54 a 0.948 a 0.301 a 1795 a B + IT + 4M 2.90 a 0.180 a 3.52 a 0.963 a 0.339 a 1405 a B + 2T 2.80 a 0.190 a 3.50 a 0.993 a 0.382 a 1698 a B + 2T + 3S 2.98 a 0.193 a 3.59 a 0.963 a 0.352 a 1858 a CV (%) 10.0 7.5 5.2 4.2 12.5 19.1 Experiment 4 B + 1T (Control) 2.94 a 0.196 a. 4.41 a 0.875 a 0.307 a 184 a B + 1T + 4S 2.97 a 0.187 a 3.89 a 0.840 a 0.251 a 204 a B + 1T + 4M 3.13 a 0.201 a 4.78 a 0.859 a 0.296 a 212 a B + 2T 2.95 a 0.194 a 4.41 a 0.823 a 0.280 a 220 a B + 2T + 3S 3.20 a 0.199 a 3.88 a 0.862 a 0.256 a 234 a C V (%) 6.4 5.1 10.7 5.4 10.8 153 TABLE 6. Net returns obtained from different cropping systems. Cropping Net returns EC$/ha/system) % relative Cropping % relative Systems Experiment 3 Experiment 4 Mean to control B + IT (Control) 2223 2311 2267 B + IT + 4S 1155 2968 2061 90.9 B + IT + 4M 1847 2494 2170 95.7 B + 2T 2760 1407 2083 91.9 B + 2T + 3S 2727 4261 3494 154.1 Acknowledgements The authors wish to express their gratitude to the International Development Research Centre (IDRC) of Canada for funding this cropping systems project, and to Messrs. G. White, E. Cordice andJ. Mark for field assistance. 248 References 1. Devos, P., and G.F. Wilson. 1978. Productivity and efficiency of plan- tain/cocoyam intercropping. Paradisiaca. No. 3:6-11 In: Horticultural abstracts 50:8500. 2. Devos, P., and G.G. Wilson. 1979. Intercropping of plantains with food crops: maize, cassava and cocoyams. Fruits 34:168-174. 3. Edmunds, J.E., and M.M. Rao. (1981). Banana intercropping research in the Windward Islands. A paper presented at the 5th Association for Cooperation in Banana Research in the Caribbean and Tropical America (ACORBAT) meeting held in Guayaquil, Ecuador, 22-26June, 1981. 4. Henderson, T.H., and P.I. Gomes. 1979. A profile of small farming in St. Vincent, Dominica and St. Lucia. Report of a baseline survey. Dept. of Agric. Ext. Faculty of Agric. U.W.I., St. Augustine, Trinidad. 5. Rao, M.M. 1979. Report on banana-intercropping survey. Windward Islands Banana Growers' Association: Research and Development Division. July 1979, pp. 1-23. 6. Rao, M.M., and J.E. Edmunds. 1984. Intercropping of banana with food crops: cowpeas, maize and sweet potato. Trop. Agric. (Trinidad). 61:9-11. 7. Ruthenberg, H. 1976. Farming systems in the tropics. 2nd ed. Clarendon press. Oxford, pp. 247. PROCEEDINGS of the CARIBBEAN FOOD CROPS SOCIETY-VOL. XX