Fresnos turning brown at bottom...BER?

Just double checking my diagnosis.  This has been happening the last 2-3 weeks, i.e., my Fresno pods turning brown at the bottom.  Is this for the same reason that tomatoes might turn brown at the bottom?   BER?  Possibly, over watering?  If it is BER, then I'm guessing 1tsp of cal-mag per gallon is the remedy?
 
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