How does nitrogen affect a turfgrass plant? Phosphorus? Potassium?

Nitrogen is the most important element that the turfgrass plant requires. It is found widely in nature, although only a small amount is readily available to plants. It promotes shoot growth, which allows for a thicker, denser lawn. Nitrogen helps provide the plant with its healthy green color. Phosphorus is necessary to the growth of a turfgrass plant because it helps the plant develop and form a healthy root system. It is also important in preserving the metabolic pathways in the plant. Potassium gives the turfgrass plant strength and helps it withstand many stresses such as drought, traffic and/or disease pressures.