I haven't grown in a community garden so I don't know if they take care of adjusting pH by adding lime to the plots or anything. If you're talking tomatoes, I generally keep it pretty simple- just dig in some compost and apply a dry organic fertilizer in a circle at least 3" away from the stem at planting time, scratch it into the dirt a bit, water, and cover with a light layer of grass clippings, straw, leaves or whatever to help prevent splash back. Later on in the season, plants can be fertilized again if needed with a liquid or more dry fertilizer.
You could look into your state ag office to see if they do soil tests. It might take a while at this time of the year to get results.
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