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Phosphorus budgets for the Saint Lawrence River sub-basin: A century of change in agriculture and water quality

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Year
2007

Citation

MacDonald, Graham, 2007, Phosphorus budgets for the Saint Lawrence River sub-basin: A century of change in agriculture and water quality: .

Summary

Agricultural land use is a key driver of water quality through its impact on nutrient flows across landscapes. Phosphorus (P) is commonly applied to croplands in fertilizers and manure to improve soil fertility, but excess P can accumulate in soils and may accelerate eutrophication of waterbodies. Balancing agricultural P inputs with crop requirements is therefore crucial for water quality. A historical study of agricultural land use and water quality in the Saint Lawrence River sub-basin (574,000 km super(2)) is presented here, focusing on agricultural P budgets. These budgets, calculated each decade from 1901 to 2001 for the sub-basin and its tributary watersheds, reveal that while P management has improved in recent decades, large [...]

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  • National and Regional Climate Adaptation Science Centers
  • Northeast CASC

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ISBN http://sciencebase.gov/vocab/identifierScheme 9780494534427

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