Abstract
The traditional practice of broadcasting poultry litter on the soil surface could result in nutrient loss in runoff.In this study, the runoff water quality impacts of three turkey litter application (4.5 Mg/ha) methods (broadcast, surface band,and incorporated band) were investigated. In the 8-d runoff study, treatments were applied to hydrologically isolated plotsand runoff volumes were analyzed for pollutant concentrations over three runoff events (one natural, two simulated). In thenatural runoff event, incorporated banding resulted in significantly reduced ammoniacal-nitrogen (N) and total phosphorus(P) concentrations as well as total suspended solids (TSS) loadings than the other treatments. In the second (first simulated)runoff event, dissolved reactive P (DRP) concentrations were significantly lower in runoff from the incorporated band versusbroadcast treatment. No treatment effects were observed in the last (second simulated) runoff event probably due to depletionof nutrients from the effective zone of interaction due to the earlier runoff events. Overall, compared with broadcasting,incorporated banding reduced ammoniacal-N, DRP, and TSS loadings by 67%, 73%, and 53%, respectively. Hence,compared with broadcasting, incorporated banding reduced pollutant losses in runoff; however, surface banding did not giveany water quality benefits.
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