The tri-state fertilizer recommendations are based on what type of information?

• A. Soil test results for various crops.
• B. Market fertilizer prices.
• C. Historical yield data only.
• D. Pesticide resistance data.

Answer: (D)

Fertilizer recommendations are built on measuring what the soil can actually supply and what the crop needs. Soil test results for different crops reveal the soil’s available nutrients (like nitrogen, phosphorus, potassium, and micronutrients), as well as pH and other factors that influence nutrient availability. This crop-specific information lets agronomists tailor fertilizer rates to meet the real demand of the plant under current soil conditions, aiming for good yields with minimal waste and environmental impact. Market prices affect economic decisions about whether to apply fertilizer, but they don’t determine how much is needed agronomically. Historical yield data helps show past performance but doesn’t replace up-to-date soil nutrient status for current recommendations. Pesticide resistance data concerns pest management and does not set nutrient requirements.