1. Soil and Water Management Research Unit USDA‐ARS 1991 Upper Buford Circle, 439 Borlaug Hall St. Paul MN 55108 USA
2. Dep. of Agroecology and Environment, Faculty of Agricultural Sciences Univ. of Aarhus PO Box 50 Tjele DK8830 Denmark
3. AgResearch Invermay Agricultural Centre Private Bag 50034 Mosgiel 9053 New Zealand
4. Hammel Neurorehabilitation Centre and University Research Clinic Aarhus Univ. Voldbyvej 15 Hammel 8450 Denmark
5. AgResearch Lincoln Private Bag 4749 Christchurch 8140 New Zealand
6. Scotland's Rural College (SRUC) West Mains Road Edinburgh EH93JG UK
7. Plant Science Research Unit USDA‐ARS 1991 Upper Buford Circle, 439 Borlaug Hall St. Paul MN 55108 USA
8. National Lab. for Agriculture and the Environment USDA‐ARS 2110 University Blvd. Ames IA 50011 USA