1. Dep. of Soil and Water; Adelaide University; PMB No. 1 Glen Osmond South Australia 5064 Australia
2. CSIRO Land and Water; PMB No. 2 Glen Osmond South Australia 5064 Australia
3. Laboratoire Sols et Environnement; ENSAIA-INRA/INPL; 2 avenue de la Forêt de Haye, BP 172 F-54505 Vandoeuvre-les-Nancy France