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Implications of spatial and temporal variations in effects of conservation practices on water management strategies

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  • Her, Younggu
  • Chaubey, Indrajeet
  • Frankenberger, Jane
  • Jeong, Jaehak

Abstract

Conservation practices are designed and implemented to reduce soil erosion and protect water quality, but their effectiveness has been found to vary widely. This study investigated spatial and temporal variability in sediment and nutrient loads and load reductions achieved by implementing conservation practices to understand the implications of landscape heterogeneity and seasonal land-phase hydrologic variation on the effectiveness of the practices. Field-scale effects of nine conservation practices were evaluated in an agricultural watershed in the Midwest using the SWAT model. Results show that the conservation practice effectiveness, and the variability of the practice effectiveness at different locations, vary widely. Most practices are more effective in reducing nutrients in particulate than soluble forms. Practices applied to fields with higher nutrient loads do not necessarily lead to greater load reduction, indicating that an assumption of a proportional relationship between load and expected load reduction on which common targeting strategies for conservation practice placement are based may not be valid for nutrient, in particular soluble forms. The variation of the practices by fields and seasons suggests that achievement of water quality improvement requires careful selection of conservation practices and target areas considering hydrologic variations.

Suggested Citation

  • Her, Younggu & Chaubey, Indrajeet & Frankenberger, Jane & Jeong, Jaehak, 2017. "Implications of spatial and temporal variations in effects of conservation practices on water management strategies," Agricultural Water Management, Elsevier, vol. 180(PB), pages 252-266.
    • Handle: RePEc:eee:agiwat:v:180:y:2017:i:pb:p:252-266
    DOI: 10.1016/j.agwat.2016.07.004
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    References listed on IDEAS

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    1. Parajuli, P.B. & Mankin, K.R. & Barnes, P.L., 2008. "Applicability of targeting vegetative filter strips to abate fecal bacteria and sediment yield using SWAT," Agricultural Water Management, Elsevier, vol. 95(10), pages 1189-1200, October.
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    Cited by:

    1. Ramesh P. Rudra & Balew A. Mekonnen & Rituraj Shukla & Narayan Kumar Shrestha & Pradeep K. Goel & Prasad Daggupati & Asim Biswas, 2020. "Currents Status, Challenges, and Future Directions in Identifying Critical Source Areas for Non-Point Source Pollution in Canadian Conditions," Agriculture, MDPI, vol. 10(10), pages 1-25, October.
    2. Pérez-Gutiérrez, Juan D. & Paz, Joel O. & Tagert, Mary Love M. & Sepehrifar, Mohammad, 2020. "Impact of rainfall characteristics on the NO3 – N concentration in a tailwater recovery ditch," Agricultural Water Management, Elsevier, vol. 233(C).
    3. Sith, Ratino & Watanabe, Atsushi & Nakamura, Takashi & Yamamoto, Takahiro & Nadaoka, Kazuo, 2019. "Assessment of water quality and evaluation of best management practices in a small agricultural watershed adjacent to Coral Reef area in Japan," Agricultural Water Management, Elsevier, vol. 213(C), pages 659-673.

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