If a fertilizer ratio is 5-10-15, what element does the number 5 represent?

In a fertilizer ratio such as 5-10-15, the first number represents the percentage of nitrogen present in the fertilizer. Nitrogen is a crucial nutrient for plant growth as it plays a significant role in the development of chlorophyll, the compound plants need for photosynthesis. It is vital for foliage growth as it contributes to the overall health and leaf biomass of plants.

In this specific ratio, the number 5 indicates that 5% of the fertilizer's weight is nitrogen, which is essential for promoting vigorous plant growth. While phosphorus and potassium are also important nutrients, they are represented by the second and third numbers in the ratio, respectively. Calcium, while beneficial for plant structure, is not measured in this particular fertilizer ratio. This understanding of fertilizer ratios helps in selecting the right type of fertilizer for specific crops and their growth stages.