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TECHNICAL REPORTS

Vadose Zone Processes and Chemical Transport

Halting the Upward Trend in Soluble Phosphorus Transported from a Grassland Catchment

^a Agricultural and Environmental Science Division, Agriculture and Food Science Centre, Newforge Lane, Belfast BT9 5PX, United Kingdom
^b Biometrics Division, Department of Agriculture and Rural Development, Agriculture and Food Science Centre, Newforge Lane, Belfast BT9 5PX, United Kingdom

^* Corresponding author (roger.smith{at}dardni.gov.uk).

An upward trend in soluble reactive phosphorus (SRP) concentrations in Northern Ireland rivers leading to increased eutrophication has been reported for the last two decades. To identify if a similar trend could be observed in land drainage waters SRP and other P fractions were measured weekly from 1989 to 1997 in land drainage from a 9-ha grassland catchment in Northern Ireland that had a mean P surplus applied of 23.4 kg P ha^-1 yr^-1. Regressions of annual median concentrations of P fractions in land drainage waters against time for 1989 through to 1997 showed significant increases of SRP and soluble unreactive phosphorus (SUP) of 2.4 and 1.2 µg P L^-1 yr^-1, respectively. However, the annual flow-weighted concentrations and loads of all P fractions did not show significant increases with time. During the period 1998–2000 a change of management was introduced when only maintenance dressings of P were applied to the catchment according to Ministry of Agriculture, Fisheries and Food guidelines. This resulted in significant reductions in SRP concentrations in 2000 compared with 1997.

Abbreviations: AFWM, annual flow-weighted mean • ET, evapotranspiration • PP, particulate phosphorus • SRP, soluble reactive phosphorus • SUP, soluble unreactive phosphorus • TP, total phosphorus

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This Issue in Journal of Environmental Quality

JEQ 2003 32: 1931-1938. [Full Text]