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What is the minimum percentage of plant food in a fertilizer referred to as?

  1. Ratio

  2. Quality

  3. Guaranteed analysis

  4. Grade

The correct answer is: Guaranteed analysis

The term referred to in this context is known as "guaranteed analysis." This terminology is used on fertilizer labels to provide information about the minimum percentage of essential nutrients, such as nitrogen, phosphorus, and potassium, present in the product. The guaranteed analysis acts as a quality assurance measure, allowing consumers to understand the specific nutrient content they can expect from the fertilizer. By law, manufacturers are required to indicate these minimum percentages to ensure transparency and support informed purchasing decisions by farmers and gardeners. This information helps users select the appropriate fertilizer based on the nutrient requirements of their crops. In contrast, while "grade" refers to the classification of fertilizers based on nutrient content, and "ratio" denotes the comparative proportions of nutrients, these concepts do not specifically communicate the minimum nutrient percentages. "Quality" is a more general term and does not provide the specific nutrient information represented in the guaranteed analysis.