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Int. J. Environ. Res. Public Health 2011, 8(6), 2181-2199; doi:10.3390/ijerph8062181
Article

Assessing the Long Term Impact of Phosphorus Fertilization on Phosphorus Loadings Using AnnAGNPS

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Received: 14 February 2011; in revised form: 7 June 2011 / Accepted: 9 June 2011 / Published: 14 June 2011
(This article belongs to the Special Issue Soil Pollution: Prevention and Mitigation)
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Abstract: High phosphorus (P) loss from agricultural fields has been an environmental concern because of potential water quality problems in streams and lakes. To better understand the process of P loss and evaluate the effects of different phosphorus fertilization rates on phosphorus losses, the USDA Annualized AGricultural Non-Point Source (AnnAGNPS) pollutant loading model was applied to the Ohio Upper Auglaize watershed, located in the southern portion of the Maumee River Basin. In this study, the AnnAGNPS model was calibrated using USGS monitored data; and then the effects of different phosphorus fertilization rates on phosphorus loadings were assessed. It was found that P loadings increase as fertilization rate increases, and long term higher P application would lead to much higher P loadings to the watershed outlet. The P loadings to the watershed outlet have a dramatic change after some time with higher P application rate. This dramatic change of P loading to the watershed outlet indicates that a “critical point” may exist in the soil at which soil P loss to water changes dramatically. Simulations with different initial soil P contents showed that the higher the initial soil P content is, the less time it takes to reach the “critical point” where P loadings to the watershed outlet increases dramatically. More research needs to be done to understand the processes involved in the transfer of P between the various stable, active and labile states in the soil to ensure that the model simulations are accurate. This finding may be useful in setting up future P application and management guidelines.
Keywords: AnnAGNPS watershed modeling; phosphorus fertilization rates; phosphorus loss AnnAGNPS watershed modeling; phosphorus fertilization rates; phosphorus loss
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yuan, Y.; Bingner, R.L.; Locke, M.A.; Stafford, J.; Theurer, F.D. Assessing the Long Term Impact of Phosphorus Fertilization on Phosphorus Loadings Using AnnAGNPS. Int. J. Environ. Res. Public Health 2011, 8, 2181-2199.

AMA Style

Yuan Y, Bingner RL, Locke MA, Stafford J, Theurer FD. Assessing the Long Term Impact of Phosphorus Fertilization on Phosphorus Loadings Using AnnAGNPS. International Journal of Environmental Research and Public Health. 2011; 8(6):2181-2199.

Chicago/Turabian Style

Yuan, Yongping; Bingner, Ronald L.; Locke, Martin A.; Stafford, Jim; Theurer, Fred D. 2011. "Assessing the Long Term Impact of Phosphorus Fertilization on Phosphorus Loadings Using AnnAGNPS." Int. J. Environ. Res. Public Health 8, no. 6: 2181-2199.



Int. J. Environ. Res. Public Health EISSN 1660-4601 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert