An integrated connectivity risk ranking for phosphorus and nitrogen along agricultural open ditches to inform targeted and specific mitigation management ...

• Main Authors: Opoku, D. G., Healy, Mark G., Fenton, Owen, Daly, K., Condon, T., Tuohy, Patrick
• Format: Article in Journal/Newspaper
• Language: English
• Published: Frontiers Media 2024
• Subjects: Agricultural ditches; water quality; nutrient loss; grassland; drainage management; connectivity pathways; North Atlantic Europe; North Atlantic
• Online Access: https://dx.doi.org/10.13025/18377; https://researchrepository.universityofgalway.ie/handle/10379/18059

On dairy farms with poorly drained soils and high rainfall, open ditches receive nutrients from different sources along different pathways which are delivered to surface water. Recently, open ditches were ranked in terms of their hydrologic connectivity phosphorus (P) along the open ditch network. However, the connectivity risk for nitrogen (N) was not considered in that analysis, and remains a knowledge gap. In addition, the P connectivity classification system assumes all source-pathway interactions within open ditches are active, but this may not be the case for N. The objective of the current study, conducted across seven dairy farms, was to create an integrated connectivity risk ranking for P and N simultaneously, to better inform where and which potential mitigation management strategies could be considered. First, a conceptual figure of known N open ditch source-pathway connections, developed using both the literature and observations in the field, was used to identify water grab sampling locations on ...