I always seem to have an old bag of garden lime too, it's the dolomite I have though. Usually clumped up, and just like you I don't measure but take a piece I can fit in my hand and crush and sprinkle before mixing with the fork. Probably about the same amount, quarter cup or so per five gallon volume.
Now and then I've had algae start to grow on the surface of some container soil, and when I see that I remove the gunk and sprinkle some more lime. That seems to work.
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