Organic Farming Standards

Soil Fertility and Biodiversity in Organic Farming (Abstract), by Paul Maeder et al, Science 31 May 2002:Vol. 296. no. 5573, pp. 1694 - 1697)

Long-term Organic Agriculture Studies in Switzerland by Paul Maeder, The Research Institute of Organic Agriculture (FiBL)

Legume-based cropping systems have reduced carbon and nitrogen losses (Abstract), by L. E. Drinkwater et al, Nature 396, 262-265 (19 November 1998)