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best way to clear old soil of root material?

I have hard clay which I've been trying to improve by drilling holes with an augur drill and filling them with compost but there are lots of old roots beneath the soil here. It really seeme like under every inch of soil there are very hard roots waiting. Some of them are very big and very hard. The augur gets stuck on them and sometimes they wrap around the drill bit, or the augur gets stuck deep in the soil and it takes quite a bit of effort to get it out again.

What is the best way to clear out old root material like this from the ground?

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