Leading scientists, including the agronomist Claude Bourguignon, report soil nourished along biodynamic growing principles is twice as rich in micro-organism at its deep layers than other soil.
Biodynamic growing is, in a nutshell, treating a farm like a closed-loop ecosystem. It should be so diverse in its flora and fauna, and running as close to its natural state as possible, that there is no need to bring in outside nutrients like fertilizers. However, while it sounds simple enough, biodynamic principles are actually quite complex, taking into account not just keeping chickens and a compost heap, but also taking into account the phases of the moon and the orientation of the planets when planning when to accomplish which farming tasks.
Photo via Jaymi Heimbuch