1. Ali, M. M., Chaudhury, S. H. and Mannan, M. A. (1977) Effect of potassic fertilizer on yield of tea. Tea Journal of Bangladesh, 13(1), 10–17.
2. Anon. (1965a) Nitrogen, in Tea Research Institute of East Africa, Annual Report 1965, Kericho, Kenya, p. 10.
3. Anon. (1965b) Phosphate, in Tea Research Institute of East Africa, Annual Report 1965, Kericho, Kenya, pp. 11–13.
4. Anon. (1965c) Nutrition. General, in Tea Research Institute of East Africa, Annual Report 1965, Kericho, Kenya, p. 9.
5. Anon. (1969) Leaf analysis, in Tea Growers Handbook 1st edn, Tea Research Institute of East Africa, Kericho, Kenya, pp. 144–6.