Fertilizer Rates

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fertilizer rates

When discussing calculating fertilizer rates, two questions I get all the time is how much fertilizer should I put down or how to set lawn spreader? Another famous question is how many square feet is my yard?

On the bottom of the page we discuss square footage of lawn area

Here we calculate fertilizer rates

We concentrate on Nitrogen (N) at the 1 pound per 1000 square foot calculation.

The formula can be used for any of the nutrients or minerals for example Phosphorus (P) or Potassium (K)

Let’s calculate fertilizer rates of 1 pound of
Nitrogen per 1000 sq feet.

For example let’s say we’re using an organic fertilizer with the numbers of 4-2-4.

The numbers on the bag represent the percentage of that product in the bag. So the first number, which is Nitrogen (N) is 4, so we want to divide 4 into 100 and which is 25.

So you’ll need 25 pounds of that particular fertilizer to get 1 pound of nitrogen per 1000 sq feet.

Then get the sq. footage of your lawn and divide that by 1000.

Multiply by the number of lbs. of fertilizer needed per 1000 sq. feet and that will tell you how much you need to fertilize lawn area.

Say we have 5000 square feet so 5 x 25 lbs. is 125. So you’ll need 125 lbs. of a 4-2-4 organic fertilizer to get 1 pound of Nitrogen per 1000 sq feet.

Sound expensive?

Not really. Organic fertilizer is relatively inexpensive compared to that of synthetic fertilizers.

Let’s use another example.

To calculate fertilizer rates of a bag of 6-2-2, divide 6 into 100 and that equals 16.6 so 16 pounds of that fertilizer to achieve 1 pound of Nitrogen per 1000 sq. feet.

Multiply that by 5 and you need 80 pounds of 6-2-2 to cover a 5000 sq foot lawn.

To Calculate the Square Footage of Your Lawn Area

To find the square footage of your yard, just figure out your average step length.

Lie out a measuring tape 20 feet and walk it a couple times keeping track of how many steps it takes to cover the 20 feet.

Take the average amount of steps, divide that into 20 and you’ll know the average length of each step you take.

Walk the perimeter length and width and then multiply.
L X W

Of course this isn’t absolutely accurate but it will give you a good idea of what the square footage of your yard is.

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