Yellow leaves on tomatoes plants ,too much water not enough sun
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https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm
Some tomato plant leaves yellow due to a lack of sunlight on mature plants. When the plants become large, bushy, and heavy with fruit, the top portions of the plant can block the lower portions from getting sunlight. This can cause the leaves to yellow, and is really nothing to worry about. Here is an article:
http://www.veggiegardener.com/yellowing-leaves-on-tomatoes/
try watering the bases only, not the leaves. They don't care for leaves that are wet often and can get blight. If that happens remove the blighted leaves.
It could be BOTH .
To much water. Water garden after the heat of the day to keep from burning them up.
Soil should be kept damp, not soggy. Use mulch around the plants to keep a consistant wetness. Poor soil can contribute to drying out, too. You can top dress the area with good garden soil and even add in some Black Kow to top soil to help feed the plant and retain appropriate dampness. Good luck!
There are numerous reasons for why tomato leaves turn yellow, and usually it is nothing need to worry about. The most common reason that tomato plants turning yellow is because of watering stress. Overwatering or underwatering are the most common cause of yellowing leaves on a tomato plant. Rather than watering lack of important nutrients like nitrogen, or diseases could be to blame here . https://www.urbanorganicyield.com/tomato-plant-leaves-turning-yellow/