How accurate must granular calibration be before use?

How accurate must granular calibration be before use?

• A. Within 10%, then adjust to 5%
• B. Within 2%, then adjust to 1%
• C. Within 15%, then adjust to 10%
• D. Within 20%, then adjust to 15%

Answer: (A)

When calibrating a granular applicator, you want the applied rate to match the target as closely as possible to protect plants, stay within the label, and minimize environmental impact. The recommended approach is to get the calibration within 10% of the target first, then fine-tune so the rate is within 5% of the target. This two-step process accounts for field variability—like ground speed, spread pattern, and product density—while still achieving precise, label-compliant applications. Trying for tighter tolerances like 2% or 1% is often impractical in real-world conditions, and tolerances of 15% or 20% would allow too much deviation from the intended rate, increasing the risk of over- or under-application.

When calibrating a granular applicator, you want the applied rate to match the target as closely as possible to protect plants, stay within the label, and minimize environmental impact. The recommended approach is to get the calibration within 10% of the target first, then fine-tune so the rate is within 5% of the target. This two-step process accounts for field variability—like ground speed, spread pattern, and product density—while still achieving precise, label-compliant applications.

Trying for tighter tolerances like 2% or 1% is often impractical in real-world conditions, and tolerances of 15% or 20% would allow too much deviation from the intended rate, increasing the risk of over- or under-application.