A wide variety of feedstocks can be used depending on
location, cost, and availability. The use of manure as a
feedstock is particularly attractive in areas such as the
Chesapeake Bay watershed that are under significant
environmental pressure to curtail surface application
of manure. Regulations in many areas limit the rate of
manure that can be land-applied, so pyrolyzing manure
into biochar and bio-oil could be beneficial. However,
these regulations normally limit the land application
of phosphorus and the phosphorus in the manure is
retained in the biochar.