As I have been double-digging beds in my garden here in Swaziland, I have encountered lots of trash.

Cabbage, trash, and freshly planted beans.
Trash in the garden, you say?
Why, yes, because in rural Swaziland there is no trash pickup service, so people either burn and/or bury their trash.

I found lots of ceramics, glass, tin, nails, and shoes.
My family first burns the trash in pits dug throughout the yard. Once the pit is full of non-burnable trash, it will be covered. Maybe a garden will be started over it a few years later.