How to Calculate Fertilizer Application

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Sometimes calculating how much fertilizer to place on your lawn can be very difficult to figure out. Rutgers University released a publication that easily and quickly allows you to calculate how much fertilizer to use per square foot. The calculation is based upon how much nitrogen is in your fertilizer, and depending on that percentage you get your precise fertilizer calculation.

Skill level:
Easy

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Instructions

  1. 1

    Locate on your fertilizer container how much nitrogen is located in the fertilizer mix. This is crucial to calculating how much fertilizer is needed. Most fertilizers have a 1 to 46 percent nitrogen mix.

  2. 2

    Locate Table 1 in the Rutgers University PDF file in "Resources," below. Match up the percentage of nitrogen from the container with the left column on the list. Across from it is the amount of fertilizer you need per square feet in pounds of fertilizer.

  3. 3

    Multiple the length of your lawn by the width of your lawn to calculate the square footage. Finally, take the square footage of your lawn and multiply that by the pounds from the table that corresponds with your nitrogen percentage.

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