What is defined as commercial fertilizers?

• A. Any fertilizer produced on farm
• B. Materials containing one or more recognized plant nutrients sold by a guaranteed analysis
• C. Lime and limestone products
• D. Soil amendments with no nutrients

Answer: (B)

Commercial fertilizers are products that contain one or more recognized plant nutrients and are sold with a guaranteed analysis, meaning the label specifies the exact nutrient content you’re getting. This guaranteed content lets you plan precise applications and compare products consistently. On-farm produced fertilizers aren’t commercial products because they aren’t sold with a labeled guaranteed nutrient content. Lime and limestone are used mainly to raise soil pH and provide calcium/magnesium, not as labeled nutrient sources with a guaranteed analysis for fertilization. Soil amendments that don’t supply nutrients likewise don’t meet the definition.