biodynamics

Could it be any possible to farm some bats in a cave near an outdoor-grow for guano? How do you introduce a bat to the cave, so it can attract more of them? How would you control the feeding of the bats so the guano had the highest level of phosphorus possible?

Supprised not to have seen more of this here and since it seems to be quite a wide ranging methodology general gardening seems to be a good place for a discussion. For starters the formulations seem to have some basis in science, plant biology, nutrient needs etc. But having trouble wrapping my...