Beginner Gardening: Help, Yellow leafs on Beans!!!, 1 by penut

penut wrote:
Recently planted some Bush Bean Dragon tongue wax in my garden and they started out doing great. The plants themselves have turned very light green/yellow and I am not sure how to diagnose the problem. I recently spread blood meal around the base of the roots but am wondering if this could be caused from overwatering? Heres a picture, thanks in advanced. I am gardening in arizona and the temps have been low of ~55 and highs of ~85 if that helps.