Landscape Fertilizers Advanced Fertilizer Topics for Master Gardeners Amy L. Shober, UF-IFAS Photo Credit: Amy Shober, UF-IFAS 1 of 14 ©2008 University.

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Presentation transcript:

Landscape Fertilizers Advanced Fertilizer Topics for Master Gardeners Amy L. Shober, UF-IFAS Photo Credit: Amy Shober, UF-IFAS 1 of 14 ©2008 University of Florida-IFAS

Fertilizer Terms Fertilizers can contain one or more nutrients Most fertilizers are sold as blends The fertilizer grade is the % by weight of N, P & K –Example: = 10% N, 5% P, 5% K A complete fertilizer contains N, P & K 2 of 14 ©2008 University of Florida-IFAS

Fertilizer Terms Variable physical & chemical properties Inorganic or Synthetic fertilizers - Mined or synthesized from inorganic materials Organic fertilizers -Derived solely from the remains or a by-product of an organism. 3 of 14 ©2008 University of Florida-IFAS

Fertilizer Definitions Water soluble: Fertilizer material that will dissolve in water and are immediately available for uptake by plant roots. –The terms water soluble and quick-release are synonymous. Slow- or controlled-release: Fertilizers that will release nutrients slowly over a period of time. 4 of 14 ©2008 University of Florida-IFAS

How Polymer Coated Fertilizers Work N K PN K P H2OH2O K+ NH 4 + NO 3 - H 2 PO of 14 ©2008 University of Florida-IFAS Figure Credit: Amy Shober, UF-IFAS

The Fertilizer Label The fertilizer ratio is the relationship among the grade A fertilizer has a ratio of of 14 ©2008 University of Florida-IFAS

The Fertilizer Label 3.5% ammonium % urea 24% total 7 of 14 ©2008 University of Florida-IFAS Photo credit: Amy Shober, UF-IFAS Urea Ammonium sulfate

The Fertilizer Label Potassium Chloride Copper Sulfate Boric Acid Copper Sulfate Photo: Petr Adam Shonalek 8 of 14 ©2008 University of Florida-IFAS

Practice With More Labels 9 of 14 ©2008 University of Florida-IFAS

Soil Test Recommendations 10 of 14 ©2008 University of Florida-IFAS Figure Credit: UF-IFAS Extension Soil Testing Lab Annual Recommendations (per 1000 sq. ft) –2.3 lbs N –0.4 lbs P 2 O 5 –1.4 lbs K 2 O

Apply N at 2.3 lb 1000 ft -2 … Fertilizer Grade (Ratio) P AppliedP Surplus or Deficit K AppliedK Surplus or Deficit (3-1-2) 0.76 lb+0.36 lb1.15 lb-0.25 lb ( ) 1.35 lb+0.95 lb1.76 lb+0.36 lb (1-2-1) 4.6 lb+4.2 lb2.3 lb+0.9 lb ( ) 0.76 lb+0.36 lb1.76 lb+0.36 lb ( ) 0.18 lb-0.22 lb0.42 lb-0.98 lb 11 of 14 ©2008 University of Florida-IFAS

What About Organic Fertilizers? Nitrogen is often slow release Microorganisms release nutrients during decomposition May contain micronutrients Typically low nutrient content Photo Credit: Amy Shober, UF-IFAS 12 of 14 ©2008 University of Florida-IFAS

Organic Fertilizer Labels 13 of 14 ©2008 University of Florida-IFAS

Summary Read the fertilizer label to help you make informed choices about fertilizers for your home landscape. Always follow UF-IFAS best management practices. Have your soil tested before applying fertilizers. 14 of 14 ©2008 University of Florida-IFAS Mention of trade names in this presentation is solely for providing specific information. It is not a guarantee or warranty of the products named, and does not signify that they are approved to the exclusion of others of suitable composition. Read and follow directions on the manufacturer’s label.