Nursery Special 12N-2.6P-5.0K (12-6-6), Osmocote 17N-3.1P-10.0K (17-7-12), and Polyon 24N-1.7P-10.0K (24-4-12) were coated with Ronstar 50WP (oxadiazon) at 4 concentrations and compared to spray applied Ronstar 50WP and broadcast Ronstar 2G. With Osmocote and Nursery Special-coated fertilizers, the lowest Ronstar rate resulted in less weed control than traditional herbicide application methods. Ronstar-coated fertilizers applied at the recommended rate or higher provided similar weed control to broadcast-and spray-applied pre-emergence herbicides.

herbicide application, non-target herbicide loss, controlled release fertilizers
Ronstar (oxadiazon), {3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H)-one}
prostrate spurge (Chamaesyce maculata (L.) Small), large crabgrass (Digitaria sanguinalis (L.) Scop)
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Author notes

Supported in part by The Horticultural Research Institute, 1250 I Street, N.W., Suite 500, Washington D.C. 20005 and Pursell Industries, 201 W. 4th Street, Sylacauga, AL 35150.

2Graduate Research Assistant.

3Professor of Horticulture.

4Associate Professor of Horticulture.

5Associate Professor of Agronomy and Soils.

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1997