To fertilize corn, lightly broadcast some 10-10-10 over the area, till in, and then….

Plant transplants or sow seeds. Fertilize twice: at 6-8” tall and when it starts to tassel. Take some balanced fertilizer and lightly sprinkle it along one or both sides of the stalks. A good time to do this is the same time you hill your corn. Side dress with fertilizer, then hill over fertilizer and water in.