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Assessing the Effectiveness of Winter Cover Crops for Controlling Agricultural Nutrient Losses

Getahun, Elias ; Keefer, Laura L.

Journal of the American Water Resources Association, 2023-06, Vol.59 (3), p.510-522

Middleburg: Blackwell Publishing Ltd

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  • Título:
    Assessing the Effectiveness of Winter Cover Crops for Controlling Agricultural Nutrient Losses
  • Autor: Getahun, Elias ; Keefer, Laura L.
  • Assuntos: Agricultural land ; agricultural nutrient losses ; Agricultural practices ; Agricultural watersheds ; Best management practices ; Cover crops ; Crops ; Drainage area ; Drought ; Effectiveness ; hydrologic and water quality modeling ; Loss reduction ; Low flow ; mulit‐objective evolutionary algorithms (MOEA) ; Nutrient loss ; nutrient loss reduction strategy ; Optimization ; Phosphorus ; Reservoirs ; Tradeoffs ; Water quality ; Water shortages ; Water supply ; Water yield ; watershed systems modeling ; Winter
  • É parte de: Journal of the American Water Resources Association, 2023-06, Vol.59 (3), p.510-522
  • Notas: This study explores the effectiveness of winter cover crops as a nutrient loss reduction strategy using a coupled optimization‐watershed model of an agricultural watershed in Illinois.
    (JAWR).
    Discussions are open until six months from issue publication
    Journal of the American Water Resources Association
    Paper No. JAWR‐20‐0173‐P of the
    Research Impact Statement
    .
  • Descrição: ABSTRACT A nutrient loss reduction strategy is necessary to guide the efforts of improving water quality downstream of an agricultural watershed. In this study, the effectiveness of two winter cover crops, namely cereal rye and annual ryegrass, is explored as a loss reduction strategy in a watershed that ultimately drains into a water supply reservoir. Using a coupled optimization‐watershed model, optimal placements of the cover crops were identified that would result in the tradeoffs between nitrate‐N losses reduction and adoption levels. Analysis of the 10%, 25%, 50%, and 75% adoption levels extracted from the optimal tradeoffs showed that the cover crop placements would provide annual nitrate‐N loss reductions of 3.0%–3.7%, 7.8%–8.8%, 15%–17.5%, and 20.9%–24.3%, respectively. In addition, for the same adoption levels (i.e., 10%–75%), sediment (1.8%–17.7%), and total phosphorus losses (0.8%–8.6%) could be achieved. Results also indicate that implementing each cover crop on all croplands of the watershed could cause annual water yield reduction of at least 4.8%, with greater than 28% in the months of October and November. This could potentially be detrimental to the storage volume of the downstream reservoir, especially in drought years, if cover crops are adopted in most of the reservoir's drainage area. Evaluating water yield impacts, particularly in periods of low flows, is thus critical if cover crops are to be considered as best management practices in water supply watersheds.
  • Editor: Middleburg: Blackwell Publishing Ltd
  • Idioma: Inglês
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