How do you verify proper calibration of a seed treatment unit?

• A. Use visual estimation of coating thickness
• B. Run a test with known seed quantity, measure actual product attached vs target rate, and adjust metering accordingly
• C. Inspect the seed for color changes
• D. Calibrate only when changing product

Answer: (B)

Calibration verification means using a quantitative check to confirm the seed treatment unit is delivering the intended coating rate. You set up a known quantity of seed, run the unit, and then measure how much coating actually attaches to the seeds, comparing that to your target rate. If the measured amount is off, you adjust the metering and repeat until the actual rate matches the target. This approach accounts for differences in seed size, moisture, and potential wear in the equipment, giving you reliable, repeatable application.

Relying on visual judgments of coating thickness isn't dependable because appearances can be misleading and vary with seed lots, coating formulations, and application speed. Inspecting seed color changes also doesn't provide a precise or consistent measure of how much product was applied. And calibration isn’t something you skip until you change products; it should be verified regularly and whenever process conditions or equipment are adjusted to ensure consistent performance.