1. CSIRO Land and Water, PMB 2Glen OsmondSA5064Australia
2. Water for a Health Country Flagship, Environmental Biogeochemistry Program, CSIRO Land and Water, PMB 2Glen OsmondSA5064Australia
3. Dep. of AgronomyKansas State Univ.ManhattanKS66506
4. CSIRO Land and Water, PMB 5WembleyWA6913Australia
5. CSIRO Land and WaterUniv. of AdelaidePMB 2Glen OsmondSA5064Australia