this summer was my first time growing tomatoes. I bought a San Marsano plant at a farmers' market. the plant grew about 6 feet tall--but the first dozen started to rot on the bottom. I panicked and added blood meal to the soil. Then the following week, I bought a spray (calcium) made specifically for tomatoe rot.
Well, I later found out that I had attributed to the problem--I applied too much nitrogen via the blood meal. So, out of possibly 30 eatable tomatoes, we enjoyed maybe a dozen.

the plant has a lot of flowers still--i hid it indoors this weekend because there was a frost scare. I'll take it out this week and hope for the best.

I'm more educated now and will continue to check your site for advice on next year's crop.