What does fertilizer grade indicate in fertilizer products?

The fertilizer grade specifically refers to the nutrient content present in the fertilizer product. This grade is typically expressed in a three-number format, representing the percentages of nitrogen (N), phosphorus (P), and potassium (K) in the fertilizer. For example, a fertilizer grade of 10-20-10 indicates that the product contains 10% nitrogen, 20% phosphorus, and 10% potassium by weight. Understanding the grade of a fertilizer allows users to select the appropriate product based on the specific nutrient needs of the plants they are growing, making it essential for effective fertilization practices.

Price value, packaging size, or expiration date do not define the fertilizer's efficacy or nutritional composition, which is why a focus on nutrient content is crucial for both agricultural and gardening applications.