Hatch, David; Shepherd, Mark and Hatley, Damian (2002) Understanding soil nitrogen supply: organic matter quality and quantity. UK Organic Research 2002 Conference, Aberystwyth, 26-28 March 2002. In: Powell, Jane and et al., (Eds.) Proceedings of the UK Organic Research 2002 Conference, Organic Centre Wales, Institute of Rural Studies, University of Wales Aberystwyth, pp. 145-146.