What does guaranteed analysis refer to in fertilizer products?

• A. The color guarantee
• B. The guaranteed nutrient content and proportion
• C. The warranty against pests
• D. The brand name

Answer: (B)

The guaranteed analysis is the nutrient content the manufacturer promises on the label, expressed as the minimum percentages by weight of the key plant nutrients in the fertilizer. This typically lists nitrogen, phosphorus (as P2O5), and potassium (as K2O), and may include secondary and micronutrients. It tells you exactly what nutrients are included and in what proportions, which helps you calculate application rates and compare products. It does not guarantee color, pest control, or brand name.