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Tomato leaves yellowing

Hello All,

Over the several weeks I’ve noticed that my tomato plants are turning yellow/light green. All of them seem to be doing this. I’m wondering what I’m doing wrong. I am on a North facing balcony. So I get 6-7 hours of morning and afternoon sun. I fertilize once every two weeks with a tomato fertilizer, 3-7-4. I think it looks like a nutrient deficiency. Possibly calcium? But, it may be that they just don’t get enough sun. Any help is appreciated.


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