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    Monitoring effects of Southland demonstration farm on stream water nitrate

    Cameron, Keith C.; Di, Hong J.; Roberts, A.; Beale, Nigel; Weir, J.; Borrie, N.
    Abstract
    The objective of this research work was to monitor the effects of the Southland Demonstration Farm on the concentration and amount of nitrate in the Tomoporakau Creek. The creek runs through the central area of the farm and drainage outfalls discharge directly into this stream. A detailed GPS topographical survey was conducted to confirm the drainage catchment area and hydrology of the site. Groundwater piezometers were established adjacent to the stream in order to monitor groundwater levels and compare those to stream water levels. Detailed surveys of the stream bed, stream surface, groundwater levels, and stream bank geometry were also conducted. Stream flow rate measurements were continuously monitored using “Sontek” Doppler flow equipment installed in concrete box culverts at „up-stream‟ and „down-stream‟ monitoring sites. Stream water was pumped continuously from the monitoring sites using submerged samplers that sent water to an instrument base-station at the dairy shed. The water nitrate concentration from each site was monitored in real-time using flow-through UV absorption spectrometer sensors. This system does not require any reagents as it measures the water nitrate concentration by detecting the UV light absorption by nitrate. These sensors also measure a full spectrum adsorption in order to automatically 'correct' for light absorption due to particulate material and/or other chemicals in the water.... [Show full abstract]
    Keywords
    nitrate leaching; stream water; monitoring
    Fields of Research
    0503 Soil Sciences; 050206 Environmental Monitoring
    Type
    Conference Contribution - Published (Conference Paper)
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    • Department of Soil and Physical Sciences [405]
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    CameronMonitoringEffectsFLRpaper2014.pdf
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    Copyright © The Authors & Fertilizer and Lime Research Centre.
    Citation
    Cameron, K.C., Di, H.J., Roberts, A., Beale, N., Weir, J. & Borrie, N. (2014). Monitoring effects of Southland demonstration farm on stream water nitrate. In: Nutrient management for the farm, catchment and community. (Eds L.D. Currie and C L. Christensen). http://flrc.massey.ac.nz/publications.html. Occasional Report No. 27. Fertilizer and Lime Research Centre, Massey University, Palmerston North, New Zealand. 6 pages.
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