Not that they had health codes or even germs theory, it’s a really bad idea to use human waste as fertilizer. At least not without proper composting. Again, not really sure they would know that. I presume that any groups that tried it either realized not to do it quickly and wrote rules against it or died off.

Fun observation. Consider how many Jewish rules have a sanitation effect. They might now have completely understood what was happening, but they could see the effects of good food inspection and regular bathing.