Food Plot Question

Good info Allen and Treefarmer. Just what I was looking for. We dug a test hole up where the dirt had what looked like a flow of green on it thinking it may be an underground springhead but only found some clay that was keeping the sand moist in that area, I also thought about using a cattle trough or even an old bathtub with the drain plugged in a couple of spots. I guess my thinking wasn't too far off. Thanks for the tip on the iron & clay peas. I will definately put some in this next spring.