Exactly ^^. "Collecting and distributing" would have been a better choice of words than "producing" in my post above.Things like oyster shell flour, fishbone and feather meal are industry by-products. Those in particular come from the oyster\seafood and poultry industries. Alfalfa is grown for various purposes, mostly for animal feed and it can grow in lots of places. Humic acid may be extracted from a variety of sources, including brown coal (lignite).