The long-term DOK trial, the oldest and most important of its kind worldwide, in which the three farming systems biodynamic, organic and conventional are being compared, is celebrating its birthday. Paul Mäder, head of the Soil Sciences Department at FiBL Switzerland, summarises the most exciting results from 40 years of the DOK trial.

in the PDF from page 38: https://www.fibl.org/fileadmin/documents/en/activity-report/activityreport2018.pdf