Hi Dicinox, did you apply any fertilizer? I think it could be a nutrient deficiency, particularly nitrogen. The main symptoms are older leaves turn pale green to yellow and eventually dry up. The possible reasons may be due to no nitrogen applied or leaching of nitrogen due to excess watering, mulching the plant with organic materials may lead to the utilization of nitrogen for decaying, poor root development, root pests and diseases.
http://aciar.gov.au/files/mn-157/pdf/...
Characteristic nitrogen (N) deficiency symptom
Nitrogen deficiency in tomato seedling
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