Slug, As mentioned hundreds of time here on T'ville inconsistent water to the root zone is the main problem causing blossom end rot. Where calcium is not delivered to the developing fruit. There are gardeners that swear by adding Tums to the planting hole, adding calcium nitrate at or after planting and/or Cal Mag. I believe soil Ph is a key factor. Before planting if you get a soil test done and it shows a Ph in the acidity range below 6.5 you should definitely add lime and/or gypsum to raise the Ph to at least 6.5. With that said, I believe more in the Cal-Mag type of approach due to tomato plants not requiring an abundance of Nitrogen as in calcium nitrate, and adding Tums to the planting hole is probably a waste of an antacid.
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Tomatovillain
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