Dean Hoffman wrote:
Note that a ton of sludge yields under 4# of nitrogen. It takes roughly
1# of N to produce a bushel of corn. Yields of 200 bu./acre aren't that
unusual anymore on irrigated farms. I think the U.S. average yield is about
130 bu./acre.
Why do you think chemical fertilizers aren't as good as manure etc.?


Thanks for the information. I guess I'm thinking mainly about low-tech,
local, sustainable solutions which don't require much transportation.
One thing for sure, manure is a renewable resource and available locally
everywhere.