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Phosphorus Removal Structures
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Video: Brief introduction to P removal structures

The P-TRAP software allows a user to design different types of phosphorus removal structures based on site conditions, phosphorus absorbing material characteristics and structure parameters. The P-TRAP software allows users to explore different designs to meet performance goals for P removal amounts and material lifetime. A database of P absorbing material characteristics is included based on previous laboratory experiments.

Training Videos

The training videos/course for P removal structures is now available for free on the ASA (American Society of Agronomy) website ( People who are not part of the ASA system will need to create a new user account, but the courses are free for use.  For information on how to access the course see this PDF document.

Here’s a direct link to the course (which will prompt for user sign-in or creation of a new user account):

P Removal Structures ASA Courses

The training videos are also available from NSERL:

P Removal Structures Training Videos


P-Trap Software

Proceed to the P-TRAP website by clicking on the link below.

P-TRAP Software Website

Please cite use of P-TRAP in one of two ways:

Penn, C. J., Frankenberger, J., & Livingston, S. (2021). Introduction to P‐TRAP software for designing phosphorus removal structures. Agricultural & Environmental Letters6(1), e20043.

Penn, Chad; Frankenberger, Jim (2020). P-TRAP Phosphorus Transport Reduction App. National Soil Erosion Research Lab.

For additional information contact Chad Penn: