Cobalto, zinco e molibdênio em Steiner (2007)

Organisms of the fungus type include the so-called fungi imperfecti and a botanical transition-form, the family of actinomycetes and streptomycetes, from which certain antibiotic drugs are derived. I have found that these organisms play a very special rôle in humus formation and decay, and that they are abundantly present in the bio-dynamic manure and compost preparations. The preparations also contain an abundance of many of the most important trace elements, such as molybdenum, cobalt, zinc, and others whose importance has been experimentally demonstrated. (Steiner 2007:7)

STEINER, Rudolf. 2007. The Agriculture Course. (Trans.: George Adams) Shrewsbury: Wilding & Son Ltd.