Zipcode if your worried about the small amount of nitrogen in a foliar spray of calcium nitrate, just use calcium carbonate instead... I use both in a foliar spray along with a foliar spray of Epsom salt, I apply the sprays 2 or 3 times a week and so far no BER in my tomatoes or bell peppers! Last year I had nothing but BER trouble in my tomato & pepper plants... But last year I wasn't using foliar sprays!
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