Phosphorus and sediment loss in a catchment with winter forage grazing of cropland by dairy cattle

Journal of Environmental Quality
R W McDowell

Abstract

The loss of phosphorus and sediment to surface waters can impair their quality. It was hypothesized that the practice of winter grazing dairy cattle on cropland of moderate slope (5-20%) would exacerbate the loss of P and suspended sediment (SS) from land to water. In a small (4.3 ha) catchment two flumes were installed, upstream and downstream of one field (about 2 ha) that had been cropped for 2 yr and grazed in winter (June-July) by dairy cattle. Flow proportional samples were taken and measured for dissolved reactive phosphorus (DRP), particulate phosphorus (PP), total phosphorus (TP), and SS. During the 2002 hydrologic year (March-February) loads of SS increased per hectare downstream (1449 kg ha(-1)) compared to upstream (880 kg ha(-1)). The same increase from upstream (873 kg ha(-1)) to downstream (969 kg ha(-1)) happened in 2003. However, while in 2003 TP increased downstream by 1.64 kg ha(-1) compared to upstream (0.24 kg ha(-1)), in 2002 an increase of only 0.006 kg ha(-1) at the downstream flume occurred compared to upstream (0.98 kg ha(-1)). Investigation of P transport pathways suggested that overland flow contributed <0.1 kg P ha(-1) to stream flow, 10 and 5% of TP load in 2002 and 2003, with the greater load in 2...Continue Reading

References

Jan 1, 1975·Environmental Letters·S J ElisenreichD E Armstrong
May 24, 2005·The Science of the Total Environment·P M HaygarthP J Butler

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Citations

Dec 2, 2008·New Zealand Veterinary Journal·Rw McDowell, Rj Wilcock
May 13, 2014·Journal of the Science of Food and Agriculture·Carolyn Hedley
Apr 6, 2017·Journal of Environmental Quality·C PilonJ Lee
Jan 12, 2007·Journal of Environmental Quality·W J ChardonC van der Salm
Jan 21, 2015·Journal of Environmental Quality·R W McDowellJ Chrystal
Mar 3, 2007·Journal of Environmental Quality·R W McDowell, R J Wilcock
May 26, 2021·Biological Reviews of the Cambridge Philosophical Society·Carla Gómez-CreutzbergJason M Tylianakis

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