NPK fertilizer refers to a type of fertilizer that contains three primary nutrients essential for plant growth: nitrogen (N), phosphorus (P), and potassium (K). These nutrients play crucial roles in various plant processes. Nitrogen is important for leaf and stem growth, phosphorus contributes to root development, flowering, and fruiting, while potassium aids in overall plant health and helps plants withstand stress. The NPK rating on a fertilizer label consists of three numbers separated by dashes, representing the percentage of nitrogen, phosphorus, and potassium in the product. For example, a fertilizer with an NPK rating of 10-10-10 contains 10% nitrogen, 10% phosphorus, and 10% potassium. The NPK values of a fertilizer are crucial for providing the necessary nutrients that may be lacking in the soil, and understanding these values helps in choosing the right fertilizer for specific plant needs. It is important to consider the balance of these nutrients, as an excess of one nutrient can harm plants and the environment. NPK fertilizers are available in various forms such as pellets, granules, powder, or liquid, and they can be purchased from retail outlets or online. When selecting an NPK fertilizer, it is essential to consider whether a slow-release or immediate feeding type is suitable for the specific plants needs.