I checked the tomato problem solver and found the following, however it doesn't really tell me what if anything I can do to correct it. The leaves are turning yellow (no brown, dried leaves), there are two other brandywines (pink and black)in the same raised bed that seem to be doing fine. Any suggestions would be appreciated.

Symptoms:

Excess salt accumulates in the tomato plant in the older leaves. Leaves turn yellow, and will eventually fall off. The plant is stunted and not vigorous, but other symptoms may be lacking. Tomatoes are relatively salt tolerant.

Control:

Salt damage is rarely encountered in field situations except under very poor water quality situations. Salt damage may become a problem in pot culture or in hydroponics. Select salt tolerant varieties.