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Zakaria Z.Z., . and Ahmad Tarmizi Mohammed, . (1984) Usage of by-products from oil palm industry. [Proceedings Paper]
Foster H.L., . and Chow C.S., . and Dolmat M.T.H., . and Zakaria Z.Z., . and Mohammed A.T., . (1985) The estimation of N and K fertilizer requirements of oil palm in Peninsular Malaysia. In: International Conference on Soils and Nutrition of Perennial Crops, 13-15 Aug 1984, Kuala Lumpur (Malaysia).