1. Adams F, Lund ZF (1966) Effect of chemical activity of soil solution aluminum on cotton root penetration of acid subsoils. Soil Sci 101: 193–198
2. Alva AK, Blarney FPC, Edwards DG, Asher CJ (1986) An evaluation of aluminum indices to predict aluminum toxicity in plants grown in nutrient solutions. Communications in Soil Science and Plant Analysis 17: 1271–1280
3. Ando T (1970) Cation absorption by excised barley roots in relation to root cation exchange capacity. Journal of the Faculty of Fisheries and Animal Husbandry, Hiroshima University 9: 83–121
4. Asher CJ, Blarney FPC, Kerven GL (1992) Recent research on soil acidity: Identifying toxic aluminium in soils. In: Tovar SJL, Quintero L (Eds) La Investgacion Edafologica en Mexico 1991–1992. Memorias del 15 Congreso Nacional de la Sociedad Mexicana de la Ciencia del Suelo. Sociedad Mexicana de la Ciencia del Suelo, Acapulco, pp 61–68
5. Barcelo J, Poschenrieder C (1990) Plant water relations as affected by heavy metal stress: A review. Journal of Plant Nutrition 13: 1–37