How much Lawn Fertilizer Do I Need?

Cool season grasses and warm season grasses have different times for application and vary somewhat in the quantity of lawn fertilizer that should be applied. Note that the number of times that fertilizer is applied will have a direct impact on the quality of the lawn. Homeowners should measure the square feet of their lawn area to determine exactly how much fertilizer is needed. Simply pace off your yard and multiply the length times the width to determine square feet. For a relatively square yard this is a simple exercise. For irregular shapes it might be best to divide the yard into square areas for measurement.

Make sure and keep the square footage numbers close at hand as over fertilization will result in wasted time and expense as well as contribute to the pollution of water supplies. The tables below will provide a guide for those attempting to determine exactly how much should be applied.

Cool Season Grasses

Since lawn fertilizer is available either in immediate release or slow release types, the following tables apply. Note the minimum and maximum amounts depending on the lawn quality desired. Please keep in mind that there should be at least 4 weeks between successive applications of fertilizer

Nitrogen Application by Month – Number of Pounds per thousand square feet – Immediate Release

Desired Lawn Quality

Sep

Oct

Nov

May 15 – June 15

Minimal

0

1

0

0 – 1/2

Acceptable

1

1

0

0 – 1/2

Lush

1

1

1

0 – 1/2

Nitrogen Application by Month – Number of Pounds per thousand square feet – Slow Release

Desired Lawn Quality

Sep

Oct

Nov

May 15 – June 15

Minimal

1.5

0

0

0

Acceptable

1.5

1.5

0

0

Lush

1.5 – 2

1.5

0

0 – 1.5

Warm Season Grasses
Nitrogen fertilization of warm season grasses using immediately available fertilizers
Nitrogen Application by Month – Number of Pounds per thousand square feet – Immediate Release

Desired Lawn Quality

April

May

June

July/Aug

Minimal

1

1

0

0

Acceptable

1

1

1

0

Lush

1

1

1

1

Nitrogen Application by Month – Number of Pounds per thousand square feet – Slow Release

Desired Lawn Quality

April/May

June/July

Minimal

2

0

Acceptable

1.5

1.5

Lush

2

2

In summary, measure your yard as precisely as possible and apply fertilizers in the recommended quantities. Keep in mind that there is considerable time and expense involved in the health and maintenance of a well manicured lawn, but the self-satisfaction of enjoyment is well worth the effort.

Comments

  1. our lawn is 20 years old and fill of moss can this be treated .

  2. Thanks for your article, it helped me in my research!

  3. grass is in newly planted so how much quantity of fertilizer apply?

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