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ARS Home » Midwest Area » Columbus, Ohio » Soil Drainage Research » Research » Research Project #441490

Research Project: Advancing Knowledge and Prediction of Phosphorus Dynamics in Tile Drained Landscapes

Location: Soil Drainage Research

Project Number: 5080-13210-003-026-R
Project Type: Reimbursable Cooperative Agreement

Start Date: Feb 1, 2022
End Date: Jan 31, 2026

Objective:
(1) Study phosporus (P)-transport mechanisms in tile drained fields by conducting flow-through experiments on surface and subsurface soils to characterize P adsorption and desorption behavior of soils as a function of texture, soil test phosphorus (STP), and flow rate (percolation rate); (2) Modify Soil & Water Assessment Tool (SWAT) model source code governing transport of soluble P to tile drains by improving P transport through macropore flow; partitioning tile discharge pathway to macropore flow vs matrix flow; incorporating the soil matrix sorption/desorption model theory into SWAT; (3) Conduct sensitivity analysis and validate the model improvements using edge-of-field monitoring data

Approach:
Lab, field and modeling approaches will be used to improve understanding phosphorus dynamics and simulation. The ARS portion will be field assessments and processes related to tile drainage. Data will be collected from the ARS edge-of-field network. Data includes discharge and phosphorus in surface and tile drainage from a subset of the edge-of-field sites. Data will be shared with partners to improve, calibrate, and validate field scale model predictions.