Lawn fertilization is very simple. It seems everyone overreacts and makes it more than it really is. In the spring, before the grass starts growing, use a high nitrogen fertilizer. Not just nitrogen-but a complete fertilizer! (The numbers on the bag are-nitrogen-phosphate-potash.) In the fall use a balanced fertilizer such as 13-13-13. Put it on just before the grass goes dormant. Buy your fertilizer at a farm store, not a lawn and garden place, and use a spreader. After the first year, sharpen your lawn mower blades.