1.UREA Prilled Urea, also known as coated prilled urea or agricultural prilled urea, is a highly efficient nitrogen-based fertilizer, recognized for its high nitrogen content of 46%. Granular urea, with a 46 percent nitrogen content, is a solid nitrogen fertilizer product. Produced from ammonia and carbon dioxide, it has the highest nitrogen content of any solid nitrogen fertilizer. 2. NPK NPK is a highly concentrated, balanced plant fertiliser. It contains nitrogen, phosphorus, and potassium. It is ideal for growing plants in poor quality soils as it provides a high amount of each of the three essential plant macronutrients.