Tomato Blossom End Rot - How to prevent it. A Frugal Garden tip that isn't included in the article is using Aspirin – Dissolve 3/4 of an uncoated asprin tablet in 1 gallon of water. Spray plants ever 2-3 weeks with the mixture to prevent fungus problems, including powdery mildew and black spot. It’s also been found to help some plants yield more fruit than using commercial fertilizers.
Tomatoes need calcium to achieve their full flavor potential, and calcium is often greatly lacking in our soils. 95% of a dry eggshell is calcium carbonate. When planting your tomato plants crush up (to powder) about 4 or 5 egg shells and put them in the bottom of the hole. Then plant your tomato on top. They'll provide calcium and prevent blossom end rot.
Tomatoes & Epsom Salt Tomatoes are prone to magnesium deficiency later in the growing season, and display this through yellow leaves and less production. When gardening, simply add one or two tablespoons per hole before planting the seeds or transplants. Then as the tomato matures, either work in one tablespoon of Ultra Epsom Salt per foot of plant height around the base of the tomato plant (individually), or create the tank sprayer solution mentioned above and use that every two weeks.