DOK

FiBL,. (2000). Organic farming enhances soil fertility and biodiversity: Results from a 21 year old field trail. FiBL Dossier 1. Research Institute of Organic Agriculture (FiBL). Retrieved from https://shop.fibl.org/CHen/mwdownloads/download/link/id/90/?ref=1

FiBL,. (2015). DOK-Trial The world’s most significant long-term field trial comparing biodynamic, organic and conventional cropping systems. Research Institute of Organic Agriculture (FiBL). Retrieved from http://www.fibl.org/en/switzerland/research/soil-sciences/bw-projekte/dok-trial.html

Alfӧldi, T., Mader, P., Besson, J. M., & Niggli, U.. (1995). DOK-trial: Long-term effects of bio-dynamic, bio-organic and conventional farming systems on soil conditions, yield and product quality. 1st Meeting on Fertilization Systems in Organic Farming. Darmstadt.