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Getting the correct amount of seed planted with a grain drill requires calibrating the drill before planting begins. Jim Johnson, Noble Foundation soils and crops consultant, demonstrates step-by-step how to perform this calibration and the calculations required to determine accurate seed output. Resources needed to perform the calibration are a vehicle jack, a tape measure, a roll of adhesive tape, five lightweight cups (e.g., Styrofoam coffee cups), a scale that measures in grams, a calculator, and one or two assistants to help catch seed in the cups. To determine the correct amount of seed to catch in the cups, perform the following three-step calculation: Step one – Take the circumference of the tire in feet x the row spacing in feet x the number of times you turn the drive wheel = the size of your test area. Step two – Take the answer from step one x the pounds of seed desired per acre ÷ 43,560 (the number of square feet in 1 acre) = pounds of seed to catch per row. Step three – Take the answer from step two x 454 (the number of grams in 1 pound) = grams of seed to catch per row. This video is part of the DIY Agriculture educational series produced by The Samuel Roberts Noble Foundation.