e4cc7769_he_Merseyside_Skeptics_Society__Mode_of_application
[Biodynamic Preparations] 501 [Contents of the preparation] Ground quartz (silica) mixed with rain water and packed in a cow’s horn, buried in spring and then dug up in autumn [Mode of application] 
Sprayed on the crop plants
Biodynamic Whine « The Merseyside Skeptics Society
Mode of application