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Old June 5, 2017   #8
venturabananas
Tomatovillian™
 
Join Date: Feb 2012
Location: Ventura, CA
Posts: 113
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I'm not a SIP expert, but I do grow most of my tomatoes in containers, 15-20 gallon. For me BER is a clear sign of uneven watering, specifically letting them dry out. Just based on the photos, that mix looks really dry at the top. Personally, I'd apply a thick layer of bark mulch (or something else that is easy to deal with and still allows top watering) and see if that helps. I wonder if with those really high temps, the wicking is fast enough to keep the soil in the top half of the bed moist.
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