Forecasting the decline of excess soil phosphorus in agricultural catchments

Article


Wall, D. P., Jordan, P., Melland, A. R., Mellander, P. -E., Mechan, S. and Shortle, G.. 2013. "Forecasting the decline of excess soil phosphorus in agricultural catchments." Soil Use and Management. 29 (S1), pp. 147-154. https://doi.org/10.1111/j.1475-2743.2012.00413.x
Article Title

Forecasting the decline of excess soil phosphorus in agricultural catchments

ERA Journal ID5277
Article CategoryArticle
AuthorsWall, D. P. (Author), Jordan, P. (Author), Melland, A. R. (Author), Mellander, P. -E. (Author), Mechan, S. (Author) and Shortle, G. (Author)
Journal TitleSoil Use and Management
Journal Citation29 (S1), pp. 147-154
Number of Pages8
Year2013
PublisherJohn Wiley & Sons
Place of PublicationChichester, West Sussex. United Kingdom
ISSN0266-0032
1475-2743
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1475-2743.2012.00413.x
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1111/j.1475-2743.2012.00413.x/full
Abstract

Measures within the European Union Nitrates Directive National Action Programmes in many member states aim to reduce soil phosphorus (P) levels from excessive to agronomically optimum. This is to reduce the risk of diffuse P losses to water and ultimately help achieve the Water Framework Directive targets of good water quality status. In this study, a 'Soil P Decline' model was used to evaluate this expectation for soils in four intensive agricultural catchments. Realistic annual P-balance scenario deficits (-30, -15, -7 kg P/ha) were used to estimate the average time required for soils to decline to optimum levels in two predominantly arable and two grassland catchments with excessive soil test P (STP). Depending on the STP concentration and total P reserves, for the smallest field P deficit scenario (-7 kg P/ha), the model predictions were for an average of between 5 and 20 yr for agronomically optimum levels to be reached. Under the largest P deficit scenario (-30 kg P/ha), it was forecast to take between 2 and 10 yr. These predictions highlight the likely time lag that exists between implementation of soil P mitigation regulations and the desired outcome of few or no fields with excessive soil P. Expectations for water quality improvement through diffuse P source mitigation must also factor in additional time for P decline model uncertainty, land management variability and time for P sources to transfer to and within river networks.

Keywordsarable; diffuse P sources; grassland; phosphorus balance; water quality
ANZSRC Field of Research 2020410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
400499. Chemical engineering not elsewhere classified
300207. Agricultural systems analysis and modelling
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Byline AffiliationsTeagasc Agriculture and Food Development Authority, Ireland
University of Ulster, United Kingdom
Institution of OriginUniversity of Southern Queensland
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