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Effects of changes in N-fertilizer management on water quality trends at the watershed scale

Author

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  • Nangia, Vinay
  • Gowda, Prasanna H.
  • Mulla, D.J.

Abstract

In this study, the ADAPT (Agricultural Drainage and Pesticide Transport) model was calibrated and validated for monthly flow and nitrate-N losses, for the 2000-2004 period, from two minor agricultural watersheds in Seven Mile Creek (SMC-1 and SMC-2) in south-central Minnesota. First, the model was calibrated and validated using the water quality data from the SMC-1 and again independently validated with the SMC-2 dataset. The predicted monthly flow and associated nitrate-N losses agreed reasonably with the measured trends for both calibration (r2Â =Â 0.81 and 0.70 for flow and nitrate-N losses, respectively) and validation (r2Â =Â 0.85 and 0.78 for flow and nitrate-N losses from SMC-1, and 0.89 and 0.78 for flow and nitrate-N losses from SMC-2, respectively) periods. The model performed less satisfactorily for the snowmelt periods than it did for the entire simulation period. Using the calibrated model, long-term simulations were performed using climatic data from 1955 to 2004 to evaluate the effects of climatic variability and N application rates and timing on nitrate-N losses. The predicted nitrate-N losses were sensitive to N application rates and timing. A decrease in the fall N application rate from 179.3 to 112Â kg/ha decreased nitrate-N losses by 23%. By changing application timing from fall to spring at a rate of 112Â NÂ kg/ha, nitrate-N losses decreased by 12%. The predicted nitrate-N losses showed a linear response to precipitation with larger losses generally associated with wet years. A 25% increase in mean annual precipitation would offset reductions in nitrate-N loss achieved using better N fertilizer management strategies described above.

Suggested Citation

  • Nangia, Vinay & Gowda, Prasanna H. & Mulla, D.J., 2010. "Effects of changes in N-fertilizer management on water quality trends at the watershed scale," Agricultural Water Management, Elsevier, vol. 97(11), pages 1855-1860, November.
  • Handle: RePEc:eee:agiwat:v:97:y:2010:i:11:p:1855-1860
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    Cited by:

    1. Zhang, Wendong & Wilson, Robyn S. & Burnett, Elizabeth & Irwin, Elena G. & Martin, Jay F., 2016. "What motivates farmers to apply phosphorus at the “right” time? Survey evidence from the Western Lake Erie Basin," ISU General Staff Papers 201608040700001588, Iowa State University, Department of Economics.
    2. Hunggul Yudono Setio Hadi Nugroho & Markus Kudeng Sallata & Merryana Kiding Allo & Nining Wahyuningrum & Agung Budi Supangat & Ogi Setiawan & Gerson Ndawa Njurumana & Wahyudi Isnan & Diah Auliyani & F, 2023. "Incorporating Traditional Knowledge into Science-Based Sociotechnical Measures in Upper Watershed Management: Theoretical Framework, Existing Practices and the Way Forward," Sustainability, MDPI, vol. 15(4), pages 1-27, February.
    3. Yan, Fulai & Zhang, Fucang & Fan, Xingke & Fan, Junliang & Wang, Ying & Zou, Haiyang & Wang, Haidong & Li, Guodong, 2021. "Determining irrigation amount and fertilization rate to simultaneously optimize grain yield, grain nitrogen accumulation and economic benefit of drip-fertigated spring maize in northwest China," Agricultural Water Management, Elsevier, vol. 243(C).
    4. Suresh Sharma & Indrajeet Chaubey, 2017. "Surface and Subsurface Transport of Nitrate Loss from the Selected Bioenergy Crop Fields: Systematic Review, Analysis and Future Directions," Agriculture, MDPI, vol. 7(3), pages 1-20, March.
    5. Jeffrey D. Mullen & Mary Katherine Rubin, 2024. "A Rapid Assessment Technique for Identifying Future Water Use and Pesticide Risks Due to Changing Cropping Patterns," Sustainability, MDPI, vol. 16(11), pages 1-16, June.

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