Comparing phosphorus management strategies at a watershed scale

Richard W. McDowell, Andrew N. Sharpley, Douglas Brian Beegle, Jennifer Weld

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The persistence of water quality problems has directed attention toward reduction of agricultural non-point sources of phosphorus (P). We assessed the practical impact of three management scenarios of the USDA-EPA Strategy for Animal Feeding Operations to reduce P losses from a watershed. Using an agronomic threshold of 50 mg Mehlich-3 P kg-1 soil, 55% of our watershed would receive no P as fertilizer or manure. An environmental threshold of 190 mg Mehlich-3 P kg-1 soil, above which P loss in runoff increases, restricts future P inputs to less titan crop removal on 32% of the watershed. Finally, a site assessment P index, which accounts for likely source and transport risks was used. This showed none of the watershed was at high risk of P loss and that areas of medium risk (where remedial measures should be considered) were near the stream channel. In the watershed studied, the P index was the best method to target remedial management to minimize P export and impacted less land area than the other strategies.

Original languageEnglish (US)
Pages (from-to)306-315
Number of pages10
JournalJournal of Soil and Water Conservation
Volume56
Issue number4
StatePublished - Dec 1 2001

Fingerprint

watershed
phosphorus
animal feeding operations
Titan
stream channel
stream channels
USDA
animal manures
manure
soil
runoff
persistence
water quality
fertilizer
fertilizers
crop
animal
crops
loss
index

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Water Science and Technology
  • Soil Science
  • Nature and Landscape Conservation

Cite this

McDowell, R. W., Sharpley, A. N., Beegle, D. B., & Weld, J. (2001). Comparing phosphorus management strategies at a watershed scale. Journal of Soil and Water Conservation, 56(4), 306-315.
McDowell, Richard W. ; Sharpley, Andrew N. ; Beegle, Douglas Brian ; Weld, Jennifer. / Comparing phosphorus management strategies at a watershed scale. In: Journal of Soil and Water Conservation. 2001 ; Vol. 56, No. 4. pp. 306-315.
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McDowell, RW, Sharpley, AN, Beegle, DB & Weld, J 2001, 'Comparing phosphorus management strategies at a watershed scale', Journal of Soil and Water Conservation, vol. 56, no. 4, pp. 306-315.

Comparing phosphorus management strategies at a watershed scale. / McDowell, Richard W.; Sharpley, Andrew N.; Beegle, Douglas Brian; Weld, Jennifer.

In: Journal of Soil and Water Conservation, Vol. 56, No. 4, 01.12.2001, p. 306-315.

Research output: Contribution to journalArticle

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