Salt Damage ????
I have a sweet 100 in a 5 gallon pot, with well finished compost mixed with a small amount of soil from my garden. This is my standard growing medium for veggies in pots and they have always done well so I figured I was doing something right.
The bottom leaves of this particular plant are turning bright yellow. I looked it up in the tomato problem solvers pictoral guide, and the leaves look exactly like what they have for salt damage. I just don't see how it could be salt damage, given that it is has not been fertilized, and has had only rainwater for water.
Do I perhaps need to add some fertilizer? It is the bottom quarter of the plant, the leaves are bright yellow, but otheriwse healthy, no curling or wilt.