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United States Department of Agriculture

Agricultural Research Service

Research Project: Achieving Long-Term Protection of Water Quality of Grand Lake St. Marys Through the Control of Phosphorous Input from Agricultural Practices

Location: Soil Drainage Research

2013 Annual Report


1a.Objectives (from AD-416):
Evaluate sources of phosphorus within the Grand Lake St. Marys watershed and provide support for conservation management plan development through watershed monitoring and modeling. The USDA Annualized Agricultural Non-Point Source (AnnAGNPS) pollution model will be used and monitoring information will be used for model calibration and validation. Effective conservation and drainage control practices will be identified that improves the water quality within the GLSM.


1b.Approach (from AD-416):
Install equipment to measure hydrology and collect water samples from paired field sites with and without applied conservation practice (cover crop initially). Analyze water samples for N, P, and sediment. Collect farming input data and yields data. Calibrate and validate AnnAGNPS for GLSM watershed, and evaluate multiple scenarios to optimize the impact of conservation practice placement within the watershed especially related to control of phosphorus discharge to streams and ultimately to Grand Lake St. Marys.


3.Progress Report:

Edge-of-field data sampling equipment was installed on a farm in the Beaver Creek subwatershed of the Grand Lake St Mary watershed. A pair of both surface and subsurface data collection equipment was installed in early 2012 to collect hydrology and water quality data. Soil samples have also been collected from the field pair. Following rainfall events, data is collected from the edge-of-field sampling equipment and returned to our laboratory for analysis. Progress continues to be made on populating and running the Annual Agricultural Non-Point Source Pollution Model (AnnAGNPS) for best management practice scenario analyses. Periodic updates are made to the funding agency and stakeholders.

The work and progress associated with this project support objective 1 of the parent project, specifically sub-objective 1a: Quantify the influence of conservation practices on surface discharge and water chemistry in the agricultural landscape and sub-objective 1b: Conduct field and watershed-scale studies of hydrology, nutrient, and agrichemical contributions originating from subsurface drainage.


Last Modified: 10/30/2014
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