What's this in my ground?

I was digging the garden soil to pluck the weeds and get it ready for my 2 bare root fruit trees, then hit something hard. It’s looks like a chunky root and there’s a plastic like piece right by it, does anyone know what it might be?

It’s possible a old sprinkler?

Stake for those solar walkway lights?


That must be it! There were solar light sticks there, that we pulled off before raking.