yellow leaves on tomato plant

I live in Marin County, California, just north of San Francisco. I have about ten tomato plants. This year for some reason I have yellow leaves on three of my plants. The others look great. I thought maybe a sprinkler was hitting them and they were getting too much water so I've moved them, but I want to make sure they are not needing more nutrients.
Submitted by BHGPhotoContest

"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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