Fertility & Maintenance

M. L. Agnew and S. M. Berkenbosch, Iowa State University, 1992

The purpose of this study was to compare nine natural organic fertilizers to urea.
Treatments included BioTurf 10-4-4, Sustane medium grade 5-2-4, Sustane fine grade 5-2-4, ISU experimental (10% N), Milorganite 6-2-0, Natures Preference 5-3-5, Ringer 10-2-6, Ringer 6-1-3, Howe 5-2-5 (added in 1990), Urea 46-0-0, and a control. All fertilizers were applied at 1 lb N/1000 ft2 on May 15, June 15, August 15, and September 15, 1989. This study was replicated three times in a randomized complete-block design. Individual plot dimensions are 5 ft by 10 ft.

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Michael L. Agnew, Extension Turfgrass Specialist, Iowa State University, Turfgrass Research, 1990

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Don Taylor, University of Wisconsin – River Falls, 1988

Fertilizing Turfgrass areas with slow-release nitrogen fertilizers is a common practice on golf greens, athletic fields, and other Turfgrass areas. Though more expensive than quick release nitrogen fertilizers, the advantages of longer turf response and low Turfgrass burn potential associated with slow-release forms have made them popular. When choosing and using slow-release nitrogen fertilizers, remember that release characteristics can vary dramatically with different materials and with different conditions.
Some slow release fertilizers, such as sulfur-coated urea and

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