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The article presents a study on analyzing the effect of injecting liquid swine manure on soil phosphorus runoff. It mentions the materials and methodology of the study that was conducted at the Boyd Research Farm of the Iowa State University in Boone County, Iowa and analyzes various soil treatment methods which include one without manure, another with knife injection, and other with low-disturbance injection. The study shows that manure application increases soil bioavailable phosphorus by 20-30 cm and 5-20 cm layer bellow knife injection and low disturbance injection respectively.