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While blossom end rot is caused by a lack of calcium to the developing fruits, it doesn't mean there isn't enough calcium in the soil. It is most often related to an inconsistent amount of water in the soil or being taken up by the plant. Calcium is brought to the fruit in the water the plant takes up from the soil so allowing the soil to dry out too much between waterings can cause blossom end rot. Pot-grown tomatoes are especially susceptible.
I touched on this before when I talked about pH. The belief is that minerals in your soil are continuously being leached by rain and consequently your soil is always moving towards more acidic.
Dolomite limestone is used to counteract this, to “sweeten” the soil. Minerals may or may not be leaching from your soil. If they are, it could be partially because of rain, but there are other reasons, too like growing your tomatoes in pots or containers.
If your soil is low in organic matter, which is often the case, it probably can’t hold onto minerals very well, especially if it is low in clay and high in sand and silt. If you have lots of clay, you probably don’t have much to worry about.
Tomatoes prefer a soil pH of 6.5 to 6.8 for best growth and fruit production. Treating untested soil with dolomite is risky, especially if you garden in an area where soils are known to be somewhat alkaline.