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• W4313339963 endingPage "117008" @default.
• W4313339963 startingPage "117008" @default.
• W4313339963 abstract "Dissolved reactive phosphorus (DRP) loss from agricultural soils can negatively affect water quality. Shallow subsurface pathways can dominate P losses in grassland soils, especially in wetter months when waterlogging is common. This study investigated the processes controlling intra- and inter-event and seasonal DRP losses from poorly drained permanent grassland hillslope plots. Temporal flow related water samples were taken from surface runoff and subsurface (in-field pipe) discharge, analysed, and related to the likelihood of anaerobic conditions and redoximorphic species including nitrate (NO3-) over time. Subsurface drainage accounted for 89% of total losses. Simple linear regression and correlation matrices showed positive relationships between DRP and iron and soil moisture deficit; and negative relationships between these three factors and NO3- concentrations in drainage. These data indicate that waterlogging and low NO3- concentrations control the release of P in drainage, potentially via reductive dissolution. The relationship between DRP and metal release was less obvious in surface runoff, as nutrients gathered from P-rich topsoil camoflaged redox reactions. The data suggest a threshold in NO3- concentrations that could exacerbate P losses, even in low P soils. Knowledge of how nutrients interact with soil drainage throughout the year can be used to better time soil N and P inputs via, for example, fertiliser or grazing to avoid to excessive P loss that could harm water quality." @default.
• W4313339963 created "2023-01-06" @default.
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• W4313339963 date "2023-03-01" @default.
• W4313339963 modified "2023-09-26" @default.
• W4313339963 title "Phosphorus and iron-oxide transport from a hydrologically isolated grassland hillslope" @default.
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• W4313339963 doi "https://doi.org/10.1016/j.jenvman.2022.117008" @default.
• W4313339963 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36584514" @default.
• W4313339963 hasPublicationYear "2023" @default.
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