With less effort, try cut through sod and roots by keeping on digging tools like your spade shovel sharp.
You can first clamp the shovel to a workbench making the concave side of the blade faces up. Use heavy gloves and holding a mill bastard file, push it upward along the edge of the blade. Lift and repeat.
Then follow the original bevel; if it has worn off, tilt the file at a 45-degree angle from the shovel's face. After the blade has been sharpened, flip the shovel over and make a few passes with the file to remove the resulting burr on the underside.
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