fertilizer bag (12499 bytes)

"Reading" fertilizer bags

Ideas for better living from Colorado State University

A few snow storms may separate us from our lawns between September and May, but this is still a good time to review those numbers on a bag of lawn fertilizer. What do they mean? "10-10-10," for example, means that the fertilizer contains ten percent nitrogen, ten percent phosphoric acid and ten percent potash. Or, you may see a bag with a "45-0-0." It contains urea, which is 45 percent nitrogen. This formulation contains no phosphoric acid or potash. As a rule, phosphorus is only rarely deficient. Potash is not really needed, except in some very sandy soils. Most bluegrass lawns will need about 4 pounds of nitrogen per 1,000 feet each growing season. It is best to add not more than 1 pound per 1,000 square feet at a time.

Photograph courtesy of Judy Sedbrook.

Back to Soil

Back to Lawns

Back to Home



Ask a Colorado Master Gardener | Calendar | Children | Container GardeningCSU Fact Sheets
Credits | Diseases | FAQ | Flowers | Fruits | Gardening | GlossaryHouseplants | Insects & Pests
Lawn & Grasses | Links | New to Colorado | PHC/IPM | Soil | Shrubs | Trees
Vegetables | Water Gardening | Weeds | What's New | Who We Are | Xeriscape


line4.gif (1411 bytes)

Contact Us | Disclaimer | Equal Opportunity

CSU/Denver County  Extension Master Gardener 2010
888 E. Iliff Avenue,  Denver, CO 80210
(720) 913-5278

E-Mail: denvermg@colostate.edu  

Date last revised: 01/05/2010