| Now run the spreader over the calibration distance at a normal walking pace and collect the fertilizer on the floor by sweeping it up. Then weigh out the sample and do it all over again, each time adjusting the fertilizer spreader setting to get to the desired weight for your calibration area. Once you get the desired setting, calibrate one more time for certainty and mark that setting on your spreader for that rate and that particular fertilizer. Remember that each fertilizer has its own unique size, shape, and analysis - so calibrate your spreader for each different fertilizer used. You can also use this form for seed, lime, gypsum, etc... - just place 100 in the box for "percentage".
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