Frequent, light fertilization is a tool used by golf courses for optimum growth. One way to get similar results is to use a slow-release fertilizer twice a year. Check the label to see if part of the nitrogen has been coated so it releases gradually. Check the label for iron. Even 1 percent or 2 percent is enough. Organic fertilizers like Milorganite contain iron and are naturally slow-release.
Another practice that will improve lawn health and appearance is keeping the mower blade sharp. A dull mower blade tears the leaf edges rather than cutting cleanly. The blade tips turn brown, giving an overall dull appearance to the lawn. This dullness goes away when the blade is sharpened.
Another way to improve lawn growth is to apply lime to the lawn at least once every two years. Our soils and water are naturally acidic. The lime reduces the acidity and improves grass growth. It also makes iron more readily available in the soil. Iron causes a dark green color.