Which type of fertilizer contains both nitrogen and phosphorus?

The type of fertilizer that contains both nitrogen and phosphorus is a complete fertilizer. Complete fertilizers are designed to provide plants with a balanced supply of essential nutrients, and they are typically labeled with a series of three numbers that represent the percentage of nitrogen, phosphorus, and potassium (N-P-K). A complete fertilizer would have a non-zero value for both nitrogen and phosphorus, making it suitable for a variety of plants that require these nutrients for healthy growth.

While organic and inorganic fertilizers can contain nitrogen and phosphorus, they do not specifically indicate a balance of both nutrients in the same way that a complete fertilizer does. Phosphate fertilizers, on the other hand, focus solely on providing phosphorus, and would not include nitrogen, which is essential for overall plant health. Thus, the defining characteristic of a complete fertilizer is its inclusion of both nitrogen and phosphorus, along with potentially other nutrients, making it the correct answer.