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Incidental nutrient transfers: Assessing critical times in agricultural catchments using high-resolution data

Shore, M., Jordan, P., Melland, A.R., Mellander, P.-E., McDonald, N. and Shortle, G. (2016) Incidental nutrient transfers: Assessing critical times in agricultural catchments using high-resolution data. Science of The Total Environment, 553 . 404 - 415. [Journal article]

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URL: http://www.sciencedirect.com/science/article/pii/S0048969716302959

DOI: http://dx.doi.org/10.1016/j.scitotenv.2016.02.085

Abstract

Managing incidental losses associated with liquid slurry applications during closed periods has significant cost and policy implications and the environmental data required to review such a measure are difficult to capture due to storm dependencies. Over four years (2010-2014) in five intensive agricultural catchments, this study used high-resolution total and total reactive phosphorus (TP and TRP), total oxidised nitrogen (TON) and suspended sediment (SS) concentrations with river discharge data to investigate the magnitude and timing of nutrient losses. A large dataset of storm events (defined as 90th percentile discharges), and associated flow-weighted mean (FWM) nutrient concentrations and TP/SS ratios, was used to indicate when losses were indicative of residual or incidental nutrient transfers. The beginning of the slurry closed period was reflective of incidental and residual transfers with high storm {FWM} P (TP and TRP) concentrations, with some catchments also showing elevated storm TP:SS ratios. This pattern diminished at the end of the closed period in all catchments. Total oxidised N behaved similarly to P during storms in the poorly drained catchments and revealed a long lag time in other catchments. Low storm {FWM} P concentrations and TP:SS ratios during the weeks following the closed period suggests that nutrients either weren't applied during this time (best times chosen) or that they were applied to less risky areas (best places chosen). For other periods such as late autumn and during wet summers, where storm {FWM} P concentrations and TP:SS ratios were high, it is recommended that an augmentation of farmer knowledge of soil drainage characteristics with local and detailed current and forecast soil moisture conditions will help to strengthen existing regulatory frameworks to avoid storm driven incidental nutrient transfers.

Item Type:Journal article
Keywords:Incidental, Nutrients, Slurry, Closed-period, Catchments, Water-quality
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
Environmental Sciences Research Institute > Freshwater Sciences
ID Code:34008
Deposited By: Professor Phil Jordan
Deposited On:28 Apr 2016 12:25
Last Modified:17 Oct 2017 16:22

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