1. Soils, Land Use and Environment Department Teagasc, Johnstown Castle, Co Wexford Ireland
2. School of Agriculture and Food Science University College Dublin Dublin Ireland
3. UCD Earth Institute University College Dublin Dublin Ireland
4. Fertiliser Technology Research Centre School of Agriculture, Food and Wine The University of Adelaide Gel Osmond SA Australia
5. Teagasc, Crops, Environment and Land Use Department Oak Park, Co Carlow Ireland