1. Accorsi, W.R. and Haag, H.P. (1959) ‘Alteracoes morfologicas e citologicas do cafeeiro (Coffea arabica L., var. Bourbon (B. Rodr.) Choussy) cultivado em solucao nutritiva, decorrentes des deficiencias e excessos dos macronutrientes’, Revista Cafe Portuguesas, 6, 5–19
2. Acland, J.D. (1971) East African Crops, Longmans/FAO, Rome
3. Aduayi, E.A. (1977) ‘Relationship between varying levels of copper and soil pH on the growth and mineral composition of arabica coffee plants’, Turrialba, 27, 7–16
4. Aduayi, E.A. (1978) ‘Role of phosphorus and copper in growth and nutrient composition of coffee grown in sand culture’, Turrialba, 28, 105–11
5. Ananth, B.R., Iyengar, B.R.V. and Chokkana, N.G. (1965) Widespread zinc deficiency in coffee in India’, Turrialba, 15, 81–7