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SWAT model Instances for "Quantifying nitrate leaching to groundwater from a corn-peanut rotation under a variety of irrigation and nutrient management practices in the Suwannee River Basin, Florida"
The Soil and Water Assessment Tool (SWAT) was used to simulate crop yields and nitrate leaching for corn-peanut rotations under a variety of nutrient and irrigation management practices in the Suwannee River Basin (Florida), where groundwater feeds springs that are protected by a federally mandated nutrient criteria of 0.35 mg/L Nitrate-Nitrogen (NO3-N). Data from a field experiment of nine irrigation and nitrogen (N) management treatments were used to calibrate SWAT, with good to excellent results (Nash Sutcliffe Efficiencies from 0.72 to 0.97 for soil moisture, 0.85–0.96 for crop yield, 0.48–0.96 for crop N uptake, and 0.15–0.82 for soil nitrate). The calibrated model was then used to quantify differences in crop yields, irrigation applied and nitrate leaching among practices over a range of historical weather. Soil moisture sensor-based irrigation with 246 kg N/ha for corn and 0 kg N/ha for peanut showed no statistical difference in yields compared to common practices in the region (calendar-based irrigation, fertilization of 336 kg N/ha corn and 17 kg N/ha peanut), while reducing N leaching by 40% and irrigation applied by 45% (reductions of ~70 kg N/ha/ yr and ~300 mm/year, respectively). Planting a rye cover crop during the fallow season reduced leaching by an additional ~50 N/ha/yr for all treatments. These results show the potential for widespread adoption of nutrient and water conservation practices to achieve the reductions in NO3-N load needed to meet environmental and regulatory goals without impacting crop yields.
This work is published in Rath S. , M. Zamora-Re, W. Graham, M. Dukes, and D. Kaplan, Quantifying nitrate leaching to groundwater from a corn-peanut rotation under a variety of irrigation and nutrient management practices in the Suwannee River Basin, Florida, Agricultural Water Management. https://doi.org/10.1016/j.agwat.2020.106634 , 2021.
Experimental data used to calibrate and validate the model is archived at Zamora-Re, M., J. Merrick, M. Dukes (2021). Floridan Aquifer Collaborative Engagement for Sustainability (FACETS) – Field trial data from Live Oak, Florida. Ag Data Commons. https://doi.org/10.15482/USDA.ADC/1521079.
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Zamora-Re, M., J. Merrick, M. Dukes (2021). Floridan Aquifer Collaborative Engagement for Sustainability (FACETS) – Field trial data from Live Oak, Florida. Ag Data Commons. https://doi.org/10.15482/USDA.ADC/1521079.
This resource is described by
Rath S. , M. Zamora-Re, W. Graham, M. Dukes, and D. Kaplan, Quantifying nitrate leaching to groundwater from a corn-peanut rotation under a variety of irrigation and nutrient management practices in the Suwannee River Basin, Florida, Agricultural Water Management. https://doi.org/10.1016/j.agwat.2020.106634
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This resource was created using funding from the following sources:
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National Institute of Food and Agriculture, U.S. Department of Agriculture
2017-68007-26319
Florida Department of Agriculture and Consumer Services
Contract No. 21894, 2015–2018
How to Cite
Reaver, N. G. F., W. Graham, S. Rath, M. Zamora-Re, M. Dukes, D. Kaplan (2021). SWAT model Instances for "Quantifying nitrate leaching to groundwater from a corn-peanut rotation under a variety of irrigation and nutrient management practices in the Suwannee River Basin, Florida", HydroShare, https://doi.org/10.4211/hs.0a7735b121f845f7ab0d1ac6348d9980
This resource is shared under the Creative Commons Attribution CC BY.
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