EXTENSION CONNECTION: The 4 R's of fertilizer application

Published: Sunday, June 15, 2014 at 14:58 PM.

The cliché is, “April showers bring May flowers,” but April deluges create weak plants and yellow grass.

Picture this: You were following the University of Florida/Institute of Food and Agricultural Sciences' recommendations and waited until April 15 to fertilize.

You followed the Urban Turf Rule and applied low-phosphate fertilizer with slow-release nitrogen.

Yet, your grass is yellow and the shrubs haven’t grown any. What happened?

The 18-plus inches of rainfall we experienced at the end of April flushed nearly everything, including fertilizer, out of the soil. Nitrogen and potassium are highly leachable. Phosphorus is also depleted under saturated soil conditions.

If you haven’t submitted a soil test since the storm, now is the time to do so. It’s time to apply a summer fertilizer, but it needs to address all the nutrient deficiencies created from excess rain. Soil test kits can be obtained from the Okaloosa County Extension office.

Fertilizer selection



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