If a fertilizer is labeled 5-10-20, what percentage of potash is in the fertilizer?

Fertilizers are often labeled using a three-number system that indicates the relative percentage of three essential nutrients: nitrogen (N), phosphorus (P), and potassium (K), commonly referred to as potash. In this labeling system, the numbers represent the percentage by weight of these nutrients in the fertilizer.

In the case of a fertilizer labeled 5-10-20, the last number, which is 20, indicates the percentage of potassium present in the mixture. Therefore, this means that the fertilizer contains 20% potash. Potash is crucial for plant growth as it helps with various functions, including water regulation, enzyme activation, and photosynthesis.

This understanding of fertilizer labeling is essential for gardeners and farmers to effectively choose the right type and balance of nutrients for their specific crop needs, ensuring healthy plant growth and optimal yields.