Yes, it's easy enough to mix up and poor in. You will need something by your deck joist to contain it. It will rack at the joint at the other side, just the way it goes. If you want a smooth finish you can get it with a magnesium trowel, but they are more expensive. Otherwise just use a steel one. Oh, I'd take a 2x4 or something and try to compress the earth a bit first, so it doesn't slump after.
You could also just fill it with gravel or decorative stone.
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