What can I use to add zinc to my soil, besides used coffee grounds?

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What can I use to add zinc to my soil, besides used coffee grounds? I think adding enough of the used grounds would also add acid which I do not need. Maybe I could grind up a zinc tablet & add it to the soil. We grow our vegetables in big pots, we can't plant Anything in the ground there is way to many trees. So I am open for ideas.

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