Effects of Wastewater Sludge Topdressing on Color, Quality, and Clipping Yield of a Turfgrass Mixture

The objectives of the present study were to determine the effects of the rate and timingoftheapplicationofsun-driedwastewatersludgefromafoodprocessingcompany's wastewater system on turfgrass growth and quality. The results were compared with those obtained with ammonium nitrate, and changes in the concentration of heavy metals andthepresenceoffecalcoliforminturfsoilsaftersun-driedwastewatersludgeapplication were determined. The rate and the timing of sun-dried wastewater sludge and ammonium nitrateapplicationsaffectedtheturfcolor,quality,andclippingyield.Monthlyfertilization resulted in a more uniform color and turf quality than infrequent spring and fall fer- tilization. Compared with the background values of base soils, heavy metals did not accumulate in sun-dried wastewater sludge-amended soils over the test period. Fecal coliform was not detected in sludge-amended soil samples, indicating that bacteria regrowth did not occur during the study period.

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