Biodynamic farming is free of synthetic pesticides and fertilizers in the same manner as certified organic farming. In order to qualify for Demeter Biodynamic status a farm must first meet the same 3 year transition requirement that USDA certified organic farming requires. Demeter also requires a reduction of the volume of imported materials necessary to sustain life on the farm.
Biodynamic farming involves managing a farm within the living organisim. In such a system there is a high degree of self-sufficency in all of the realms of biological survival. Fertility and feed arises out of of the recycling of organic material the system generates. Avoidance of pest species is based and biological vigor and its intrinsic biological and genetic diversity. Water is efficently cycled through the system.
What distinguishes a Demeter certified Biodynamic farm from a certified organic farm is that, in its entirely, a Demeter Biodynamic farm is managed as a living organism. This is the fundamental principal of the Biodynamic farming method.