The grass/clover ley plays a central role in most organic farms, since clover is the foundation stone for the whole farm system through its ability to fix atmospheric nitrogen. As well as providing an essential forage resource for farm livestock, grass/clover swards also form the basis of sustainable organic arable rotations.
David Younie is a graduate of the Universities of Aberdeen and Reading and has been involved in organic farming research, teaching and consultancy since the mid-1980s. He was the Scottish Agricultural College's senior consultant in organic farming, providing advice to farmers, industry and governments in Scotland, the UK and in Europe, until he retired in 2008. David still teaches on the SAC Postgradueat Diploma in Organic Farming.