Department of Soil&Crop Sciences

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Fertilization Calculator

Determine Your Fertilizer Need
Step 1
Get a good estimate of the total size (in square feet) of your lawn using tape measures, or number of paces, etc... and record that number in the box to the right. (ex. 13000 square feet) Do not use commas!
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. Use decimal equivalent - Do not use fractions ( / sign) in the box!
Step 3
What is the first number in the analysis of your bag of fertilizer? (ex. 15 - 5 - 10) This number corresponds to the percentage of nitrogen in the bag. The second number corresponds to the percentage of phosphorous and the third number, potassium.
You need pounds of fertilizer for one thousand square feet.
You need pounds of fertilizer for your entire lawn.

Designed by Jason L. Gray.