Herbicide movement from broadcast granular applications via runoff waters into containment ponds was monitored over a two-year period. The nursery site was approximately 20 ha (50 A) and contained all runoff waters and recycled it for irrigation. Levels of pendimethalin, oryzalin and oxyfluorfen applied as either OH-2 or Rout herbicides were determined in containment pond water and sediment. Herbicides were extracted by a solid-phase column method and analyzed by HPLC with confirmation by GC-MS. Generally, low herbicide levels (highest level detected was 0.013 μg/ml in water and 12 μg/g in sediment) were detected compared to quantities applied [12 to 50 kg (26 to 110 lb) ai per year]. Results showed that herbicide levels did not accumulate in containment ponds following repeated applications and there was no correlation of herbicide levels detected with amount or timing of herbicide applications.

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Author notes

Technical contribution No. 3436 of the S.C. Agric. Expt. Stn., Clemson University. Supported in part by grants from the Horticultural Research Institute, 1250 I Street, N.W., Suite 500, Washington, DC 20005, Scotts Chemical Company, Grace-Sierra Chemcial Company and the S.C. Agricultural Experiment Station Ornamental Horticulture Competitive Grant Program. Appreciation is extended to Gilbert's Nursery for their assistance and cooperation.

2Professor of Plant Pathology and Physiology

3Professor of Horticulture

4Agricultural Science Associate II

5Assistant Professor, Plant Pathology and Physiology