The Josephine Porter Institute
Applied Bio-Dynamics, Inc.

The Bio-Dynamic Preparations (BD Preps) are based on the original indications given by Rudolf Steiner. A healthy agriculture requires balance, which can be achieved only by using all nine of the BD Preps (BD#500 - 508) in one form or another. The various Bio-Dynamic Sprays are most effective AFTER the soil has first been enriched by compost or manure treated with the BD Compost Preps # 502 - 507. Although immediate results from the use of the preparations are observed in some situations, a four-year transition per use is more usual.