yellow leaves on tomato plant
"Yellowing leaves can be caused by quite a few different things. Excess moisture is one of them. It sounds as though you have taken steps to ensure that's not the case. Lack of nutrients is another. Tomatoes are heavy feeders, and often need a mid-season boost of nitrogen. Particularly if the plants are growing in containers, nitrogen can be leached from the soil with watering.
Leaf yellowing can also be caused by disease problems, but usually brown leaf spots are associated with the yellowing if disease is involved."
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