Npk fertilizer is primarily composed of three main elements: nitrogen (n), phosphorus (p), and potassium (k), each of these being essential in plant nutrition and growth. Among other benefits, nitrogen helps plants grow quickly, while also increasing the production of seed and fruit, and bettering the quality of crops. Nitrogen is also a component of chlorophyll, the substance that gives plants their green color, and also aids in photosynthesis which is the most important process in every crop development as a lot depends on how well a plant photo synthesizes. Chemical compositionnpk fertilizers are three-component fertilizers providing nitrogen, phosphorus, and potassium.   Olam brand. Nitrogen 20%phosphorus 10%potassium 10%