Calibrate Your Fertilizer Spreader
Step 1
What is percentage of nitrogen in your bag of fertilizer? This is the first number in the analysis of your fertilizer. (ex. 15 - 5 - 10)
Step 2
What rate of nitrogen do you want to put down on your lawn? We recommend not going above 1 pound of nitrogen per thousand square feet per application. Use decimal equivalent - Do not use fractions ( / sign) in the box!
Step 3
What is the width of your drop spreader or one-half the width of the throw pattern of your rotary spreader? (in feet)
Step 4
Mark out a calibration distance on a clean flat surface. We recommend at least ten feet in length for the distance. Record the distance in the box to the right.
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".
You need pounds of fertilizer for one thousand square feet.
You need pounds of fertilizer for your calibration area.
You need grams of fertilizer for your calibration area.

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Designed by Jason L. Gray.