What are OTHER reasons/solutions for blossom drop?

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The major reason for blossom drop is not too much N, rather, temperatures that are not at the level that allows for self pollenization.

And since you mentioned Armstrong Nurseries I assume you are in CA and at this time in many areas of CA the temps are too high, pollen is denatured and becomes ineffective.

Please go to the top of this first page and click on the blue link to the FAQ section. Scroll down until you find the article on blossom drop which gives some temps that are involved. It's not just the day temps b'c temps above 70 at night also inhibit fruit set as well.

Carolyn, who almost forgot to ask and can't go back to read without losing what I've written so far, is it just the KB that's having problems or all of the varieties you're growing, which would strage indeed methinks.

Hi Carolyn,
Thanks for the quick reply. I did read the FAQ (after posting). Day time temperatures for the last month here in Los Angeles have been between 64 and 80 degrees with the average being 70. Night time has not dipped below 55 in the same time frame except for once it went down to 49 a couple of weeks ago. There are no high winds down the corridor where my patio garden is. Also growing A Black Krim, Goose Creek, Stupice & Monotaro in two earthboxes. That is in addition to 6 other heirlooms from Orchard Hardware Supply (Amish Paste, Saint Pierre, Homestead 24, Marglobe Select, Rutgers Select) in two self watering containers. (Not much space on my patio) A Brandywine red? from Armstrong gardening center in it's own container as well as a taxi tomato in it's own self watering container. None of the other plants are experiencing the heavy rate of blossom drop. Just a little bit. I've enjoyed your book, "100 Heirloom Tomatoes for the American Garden". Each member of my immediate family received a copy in the last year. Thanks, Erik