Influence of hog manure application on surface runoff water quality
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This paper describes some preliminary results from a field-scale study of the effect of field application of hog manure by injection on surface runoff water quality. In the study, manure injection at rates of 7,000 and 10,000 gal ac-1 are compared to an inorganically fertilized control at sites near the Bear Hills Pork Producers barn at Perdue and the new Prairie Swine Centre at Elstow. Surface runoff water quality is assessed during snowmelt and by rainfall simulation. Analysis of the preliminary data from Perdue indicates that concentrations of total and ortho P and NH3 in snowmelt runoff from the basin receiving 10,000 gal ac-1 of hog manure increased relative to background measurements and the control basin. Concentrations of NH3 also appeared to increase in snowmelt runoff from the basin receiving 7,000 gal ac-1 of hog manure. Although the rainfall simulation data were less conclusive, nutrient concentrations in runoff from the plots receiving hog manure appeared to increase relative to the control. There was no indication that hog manure application led to increased coliform counts in runoff water.
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