1. American Public Health Association. Standard methods for the examination of water and wastewater. Fifteenth ed. American Public Health Association, Washington, D.C.
2. Blarney F P C et al. 1991 Evaluation of solution culture techniques for studying aluminium toxicity in plants. In Plant-Soil Interactions at Low pH. Eds. R D Wright et al. pp 905–912. Kluwer Academic Publishers, Dordrecht, The Netherlands.
3. Blarney F P C, Robinson N J and Asher C J 1992 Interspecific differences in alurninium tolerance in relation to root cation exchange capacity. 146, 77–82.
4. Brady D J et al. 1993 Calcium amelioration of alurninium toxicity effects on root hair development in soybean (Glycine max [L.] Merr.) New Phytol. 123, 531–538.
5. Caradus J R 1991 Genetical and environmental effects on white clover root growth and morphology. Proc. of Agron. Soc. of New Zealand. 21, 55–60.