Rob Lineberger wrote:Maybe no one has snatched up the resource because it's not something people would think to do. If you'd asked me "what's a good soil amendment?" I don't think net scrapings would have ever made the list. Good for you thinking laterally.
It is hard to visualize this but I see four potential problems:
IMO the way to check for that is ask for a crate or two of the sludge, then do a test area and plant plants. If a plant gets too much copper, it dies. I'd select an area you don't care about particularly much.
IMO the way to check for that is ask for a crate or two of the sludge, then do a test area and plant plants. If a plant gets too much salt, it dies. :)
In aquaculture, shells are a way to alter the pH and calcium carbonate (hardness) levels of the water. It's kinda hard to alter the pH of soil, but dumping a ton of seashells on it seems like a good way. I'd do a thorough pH and hardness test on your test area, then again right after dumping the scrapings, then again a few weeks later.
If you do indeed get a solid layer of algae-covered shells, I could see that leading to issues. You could get around this by screening the sludge, but screening 25 tons seems like a chore.
Now the benefits are cost, availability, and nutrients you wouldn't easily get otherwise. Is that worth the effort and risk? I don't know. It's a cool idea.