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Related Experiment Video

Updated: Jun 15, 2026

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm

Published on: December 9, 2012

Evaluating conservation program success with Landsat and SWAT.

Michael J White¹, Daniel E Storm, Philip Busteed

¹USDA-ARS Grassland, Soil, and Water Research Laboratory, Temple, TX 76502-6712, USA. mike.white@ars.usda.gov

Environmental Management

|March 10, 2010

Summary

Oklahoma conservation practices improved vegetative cover by 1.9%, reducing sediment loads by 3.5%. However, phosphorus load changes varied, with fertilizer use potentially increasing losses in some pastures.

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Area of Science:

Environmental Science
Agricultural Science
Hydrology

Background:

Conservation programs require water quality benefit quantification.
Oklahoma Conservation Commission subsidizes practices to improve water quality.

Purpose of the Study:

Evaluate conservation practice impacts on phosphorus and sediment loads to Lake Wister.
Assess the effectiveness of practices increasing vegetative cover in grazed pastures.

Main Methods:

Utilized Landsat imagery to derive vegetative indices and estimate changes in soil cover.
Employed the Soil and Water Assessment Tool (SWAT) for hydrologic simulation.
Integrated field characteristics, management data, and vegetative cover changes into SWAT models.

Main Results:

Conservation practices resulted in a 1.9% improvement in vegetative cover.
Predicted sediment load reduction of 3.5% was observed.
Phosphorus load changes varied from a 1.0% improvement to a 3.5% increase; fertilizer use in low-productivity pastures increased phosphorus losses.

Conclusions:

Combining vegetative cover analysis with hydrologic simulation is effective for basin-scale evaluation of conservation practices.
Results provide guidance for selecting future conservation measures.
Phosphorus fertilizer application as a conservation practice requires careful consideration due to potential negative impacts on water quality.