Calcium, Epsom Salts, and BER
This GardenWeb link on BER says that some have reported that foliar feeding of Epsom salts aids in the uptake of calcium by tomato plants.
Once the problem develops, quick fixes are difficult. Stabilize the moisture level as much as possible, feeding with manure or compost tea is recommended by many, foliar applications of calcium are of questionable value according to research because of poor absorption and movement to fruit where it is needed but many have reported that foliar application of magnesium (epsom salts) can effect added calcium uptake.
If one's soil has sufficient calcium, would this mean that one's soil is deficient in magnesium or just that foliar feeding provides much quicker access to magnesium than the roots can take up from what's available in the soil?