What are the steps to calibrate a broadcast spreader to apply a specific rate?

• A. Simply fill the hopper and spread
• B. Weigh a measured amount of material spread over a known area to determine rate; adjust the spreader setting to achieve the target rate per 1000 sq ft; verify with a follow-up test
• C. Read the manual and guess
• D. Spray with water to test pattern

Answer: (B)

Calibrating a broadcast spreader is about tying the amount of material released to the area covered so you can set and verify a specific rate per 1000 square feet. The best method is to weigh a measured amount of material and spread it over a known area to determine the actual rate, then adjust the spreader setting to hit the target rate per 1000 sq ft, and finally verify the result with a follow-up test. This approach provides a concrete, data-based measurement of how much material is being applied and ensures the setting reflects the desired application rate.

Think of it this way: you’re not guessing how much you’re applying. You’re measuring how much covers a defined area, converting that into a rate per 1,000 square feet, and then tuning the spreader until that rate matches your goal. A follow-up test confirms the adjustment under realistic spreading conditions.

Other options fall short because simply filling the hopper and spreading doesn’t tell you the rate, guessing from the manual relies on imperfect assumptions, and testing with water checks the pattern shape rather than the actual amount being applied per area.