1. Anghinoni I and Barber S A 1980 Phosphorus influx and growth characteristics of corn roots as influenced by phosphorus supply. Agron. J. 72, 685–688.
2. Baligar V C and Barber S A 1979 Genotypic differences of corn for ion uptake. Agron. J. 71, 870–873.
3. Bieleski R L and Ferguson I B 1983 The physiology and metabolism of phosphate and its compounds. In Encyclopedia of Plant Physiology, New Series. Vol 15A. Eds. A Läuchli and R L Bieleski. pp 422–449. Springer-Verlag, Berlin, Germany.
4. Brouwer R 1983 Functional equilibrium: sense or nonsense. Neth. J. Agric. Sci. 31, 335–348.
5. Chapin F S III 1988 Ecological aspects of plant mineral nutrition. In Advances in Plant Nutrition, Vol. 3. Eds. B Tinker and A Läuchli. pp 161–191. Praeger Publishers, New York, USA.