| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Dep. of Geography, Winter St., Univ. of Sheffield, Sheffield, S10 2TN, UK;
USDA-ARS, Pasture Systems and Watershed Management Research Lab., Building 3702, Curtin Rd., University Park, PA 16802-3702.
* Corresponding author (ans3{at}psu.edu).
ABSTRACT
Since the late 1960s, point-sources of water pollution have been reduced due to their ease of identification and treatment. As water quality problems remain and further point-source measures become less cost-effective, attention is directed toward reducing agricultural nonpoint-sources of P and N. In the past, separate strategies for P and N were developed and implemented at farm or watershed scales. Because of differing biology, chemistry, and flow pathways of P and N in soil, these narrowly targeted strategies may lead to mixed results. In some cases, N management of manures has increased soil P and subsequent P enrichment of surface runoff, while no-till has reduced P losses but increased nitrate leaching. Thus, an integrated approach to nutrient management is needed, with best management practices (BMPs) targeted to critical areas of a watershed that contribute most of the P and N exported. We have developed indices that identify critical sources and transport pathways controlling P and N export. These indices are applied to a mixed land use watershed in Pennsylvania. Areas most vulnerable to P loss are limited to small, well-defined areas of the watershed (<20% of area) near the stream channel. In contrast to P, larger areas contribute to nitrate leaching and generally occur on the upper boundaries of the watershed (60%), where freely draining soils and high manure and fertilizer N applications are made. Thus, differing levels of nutrient management may be appropriate for different areas of a watershed.
This article has been cited by other articles:
|
|
 |
|
  P. J. A. Kleinman, M. S. Srinivasan, C. J. Dell, J. P. Schmidt, A. N. Sharpley, and R. B. Bryant Role of Rainfall Intensity and Hydrology in Nutrient Transport via Surface Runoff. J. Environ. Qual., July 1, 2006; 35(4): 1248 - 1259. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. Kronvang, M. Bechmann, H. Lundekvam, H. Behrendt, G. H. Rubaek, O. F. Schoumans, N. Syversen, H. E. Andersen, and C. C. Hoffmann Phosphorus Losses from Agricultural Areas in River Basins: Effects and Uncertainties of Targeted Mitigation Measures J. Environ. Qual., November 7, 2005; 34(6): 2129 - 2144. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. B. Ferguson, J. A. Nienaber, R. A. Eigenberg, and B. L. Woodbury Long-Term Effects of Sustained Beef Feedlot Manure Application on Soil Nutrients, Corn Silage Yield, and Nutrient Uptake J. Environ. Qual., August 9, 2005; 34(5): 1672 - 1681. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. A. Wattiaux In Appreciation of Dr. Larry D. Satter--How a Career-Long Effort in Nutrition Research Will Serve Livestock Production in the Future J Dairy Sci, July 1, 2004; 87(13_suppl): E1 - 5. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. G. Klatt, A. P. Mallarino, J. A. Downing, J. A. Kopaska, and D. J. Wittry Soil Phosphorus, Management Practices, and Their Relationship to Phosphorus Delivery in the Iowa Clear Lake Agricultural Watershed J. Environ. Qual., November 1, 2003; 32(6): 2140 - 2149. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. Vellidis, R. Lowrance, P. Gay, and R. K. Hubbard Nutrient Transport in a Restored Riparian Wetland J. Environ. Qual., March 1, 2003; 32(2): 711 - 726. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. H. Franklin, J. L. Steiner, M. L. Cabrera, and E. L. Usery Distribution of Inorganic Nitrogen and Phosphorus Concentrations in Stream Flow of Two Southern Piedmont Watersheds J. Environ. Qual., November 1, 2002; 31(6): 1910 - 1917. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. W. Golladay and J. Battle Effects of Flooding and Drought on Water Quality in Gulf Coastal Plain Streams in Georgia J. Environ. Qual., July 1, 2002; 31(4): 1266 - 1272. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V.D. Nair and D.A. Graetz Phosphorus Saturation in Spodosols Impacted by Manure J. Environ. Qual., July 1, 2002; 31(4): 1279 - 1285. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Djodjic, H. Montas, A. Shirmohammadi, L. Bergstrom, and B. Ulen A Decision Support System for Phosphorus Management at a Watershed Scale J. Environ. Qual., May 1, 2002; 31(3): 937 - 945. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. C. Pautler and J.T. Sims Relationships Between Soil Test Phosphorus, Soluble Phosphorus, and Phosphorus Saturation in Delaware Soils Soil Sci. Soc. Am. J., March 1, 2000; 64(2): 765 - 773. [Abstract] [Full Text]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Vadose Zone Journal | Journal of Plant Registrations | ||||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal |
