Yes, it will hurt the beans. In my opinion, it's too late now to worry about the fertilizer. Between running over the plants, andthe chance of burning the young plants, you might as well just wait untill next year. In the mean time you can get a soil test done and see what you actually need. I doubt 50 lbs per acre would be worth your time and effort for the results (or lack of)you'd see. Fertilizer is often measured in tons per acre.