On a fertilizer label, what do the three numbers typically represent?

The three numbers found on a fertilizer label signify the percentage by weight of the primary nutrients each fertilizer contains, specifically Nitrogen, Phosphorus, and Potassium. This standard notation is commonly known as the N-P-K ratio. Each of these elements plays a crucial role in plant growth: Nitrogen is essential for vegetative growth, promoting lush foliage; Phosphorus is important for root development and flowering; and Potassium aids in overall plant health and disease resistance.

This labeling system allows gardeners and farmers to easily identify the nutrient content of fertilizers and select the appropriate type to meet the needs of their plants. The other options given do not represent the primary nutrients that are commonly monitored in fertilization practices, which is why they are not correct.