Soil organic matter : its importance in sustainable agricultural systems /
Johnston, A. E.
Poulton, P. R.
International Fertiliser Society
York : International Fertiliser Society,
2005.
"Paper presented to The International Fertiliser Society at a Conference in Cambridge, on 14th December 2005" - t.p.
Includes bibliographical references.
Humus
Soil ecology
Soil management
Sustainable agriculture