Fix your watering schedule, how often and how much affects calcium uptake. Soil should have enough calcium. Get your soil tested before adding something that is not needed. If there is calcium, then water will be needed to a good flow uptake in calcium.
"Correction to blossom end rot. This is caused by a lack of calcium uptake from the soil and resulting in little transfer to the fruits during dry weather. Too much water can interfere as well.
Blossom-end rot happens when a number of conditions come into place. The disease is especially prevalent when rapidly growing plants are exposed to wide fluctuations in water amounts. Calcium cannot be taken from the roots to the rest of plant and sustain healthy tomatoes."
Fix your watering schedule, how often and how much affects calcium uptake. Soil should have enough calcium. Get your soil tested before adding something that is not needed. If there is calcium, then water will be needed to a good flow uptake in calcium.
"Correction to blossom end rot. This is caused by a lack of calcium uptake from the soil and resulting in little transfer to the fruits during dry weather. Too much water can interfere as well.
Blossom-end rot happens when a number of conditions come into place. The disease is especially prevalent when rapidly growing plants are exposed to wide fluctuations in water amounts. Calcium cannot be taken from the roots to the rest of plant and sustain healthy tomatoes."
https://extension.psu.edu/programs/master-gardener/counties/lackawanna/news/2016/wide-fluctuations-in-water-contribute-to-summers-blossom-end-rot-in-plants