Okay. One thing Western gardeners are told in regards to compost: Do NOT compost the shit of predators! (and with that, don't compost human shit).
My Understanding (which may not be correct) is that with the introduction of meat (which you shouldn't compost) feces is no longer compostable. Or maybe not to the same degree, because 1. Pretty sure someone on here told me that the Aztecs composted human feces. 2. Tokugawa Era Japan composted it too, and it was so valuable it could be stolen.
Marie Brennan's book (that taught me the second one of those) says part of it is concern of infecting food with parasites.
I'm assuming part of it in both those cases was a diet with less meat, and the fact that Central America wasn't crawling with domesticated animals to farm with, and I'm pretty sure Japan (aside from being closed off to the outside world) is lacking the space to have loads of bovine.
Anyway, this is not just brought to you by the world-building series, but also by "What the hell did they do in the regency, dammit!!!!" (I had a source, but I never read it, and the url 404s now)