Journal article
Evaluation of Alternative Cropping and Nutrient Management Systems with Soil and Water Assessment Tool for the Raccoon River Watershed Master Plan
American journal of environmental sciences, Vol.11(4), pp.227-227
09/09/2015
DOI: 10.3844/ajessp.2015.227.244
Abstract
Soil and Water Assessment Tool (SWAT) ecohydrological model was used to assess a suite of adaptive nutrient management, alternative cropping system and combination scenarios in support of a Master Plan that was developed to help guide policy makers, land owners and other stakeholders in improving water quality for the 9,400 km super( 2) Raccoon River watershed in west central Iowa, located in the Corn Belt region of the United States. Calibration and validation of SWAT showed that the model was able to accurately replicate most streamflow and pollutant loss conditions, with r super( 2) and Nash-Sutcliffe modeling Efficiency (NSE) statistics exceeding 0.5 for the majority of indicators. The largest reduction in predicted nitrate losses at the overall watershed scale for the adaptive nutrient management scenarios was slightly over 12%, in response to a scenario in which 100% of the anhydrous ammonia fertilizer application was applied in the watershed four weeks after planting of corn. Considerably larger impacts on nitrate loss and other sediment and nutrient indicators, with some reductions exceeding 50%, were predicted for scenarios representing widescale conversion of corn-soybean rotations to six-year rotation of Corn-Soybean-Corn-Alfalfa-Alfalfa-Alfalfa (CSCAAA) or combinations of adaptive nutrient management, conversion to CSCAAA rotations and the insertion of a rye cover crop on a portion of the area managed with corn and soybean within the CSCAAA rotations.
Details
- Title: Subtitle
- Evaluation of Alternative Cropping and Nutrient Management Systems with Soil and Water Assessment Tool for the Raccoon River Watershed Master Plan
- Creators
- Philip Gassman - Iowa State UniversityManoj Jha - North Carolina Agricultural and Technical State UniversityCalvin Wolter - 502 E 9th StreetKeith Schilling - 115 Trowbridge Hall
- Resource Type
- Journal article
- Publication Details
- American journal of environmental sciences, Vol.11(4), pp.227-227
- DOI
- 10.3844/ajessp.2015.227.244
- ISSN
- 1553-345X
- eISSN
- 1558-3910
- Language
- English
- Date published
- 09/09/2015
- Academic Unit
- Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984383907302771
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