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• W3096706711 abstract "Abstract Urea‐nitrogen (N) is commonly applied to crop fields, yet it is not routinely monitored despite its association with reduced water quality and its ability to increase toxicity of certain phytoplankton species. The purpose of this work was to characterize temporal fluctuations in urea‐N concentrations and associated environmental conditions to infer sources of urea‐N in agricultural drainage ditches. Physicochemical properties and N forms in ditch waters were measured weekly during the growing seasons of 2015–2018. Fertilizer application was only associated with spring peaks of urea‐N concentrations in ditches next to cornfields, whereas summer peaks in ditches adjacent to corn ( Zea mays L.) and soybean [ Glycine max (L.) Merr.] fields were not associated with fertilizer applications. Environmental conditions of warmer temperatures, lower dissolved oxygen concentrations, and lower redox potentials were correlated with higher urea‐N concentrations. In 2018, peaks of urea‐N and ammonium‐N during the summer co‐occurred with peaks of dissolved organic N and total dissolved N, suggesting they might be associated with the breakdown of organic matter and with the turnover of the organic N pool. Although the highest urea‐N concentrations occurred when ditch surface waters were hydrologically disconnected from nearby streams, heavy rainfalls can potentially flush accumulated urea‐N into coastal waters, where it may affect algal bloom toxicity. Therefore, implementation of available drainage ditch management practices is recommended, but these strategies need to be optimized for targeting periods with high rainfall that coincide with fertilizer additions as well as for periods with low rainfall that promote stagnant water conditions." @default.
• W3096706711 created "2020-11-09" @default.
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• W3096706711 date "2020-12-11" @default.
• W3096706711 modified "2023-09-25" @default.
• W3096706711 title "Seasonal and temporal factors leading to urea‐nitrogen accumulation in surface waters of agricultural drainage ditches" @default.
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• W3096706711 doi "https://doi.org/10.1002/jeq2.20173" @default.
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