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Acid rain tends to lower soil pH. Adding lime is a good way to adjust pH and add calcium.

Last soil test mine was too alkaline from adding wood ashes. So had to add soil acidifier usually used for acid loving plants.

Tomatoes prefer somewhat acidic soil. To add calcium in the case of high pH I would think gypsum (calcium sulfate) would be first choice. Bone meal or egg shells might work. Phosphate rock might work but usually comes from bones. Not easily available. Name is hydroxy appetite.
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