• NTT - Nutrient Tracking Tool (Version 26-05)
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The Nutrient Tracking Tool was designed to be user friendly, with nine main pages:

On the Projects page, users can create a project by enter the name and description of the project, open saved projects, or upload projects from local source.

On the Location page, the users may delineate the field or fields in their project using the interactive map. Alternately, users may upload their own shape files.

On the Fields page, the users can verify the fields drawn on the Location page. Clicking on the fields allows the user to further define the field characteristics in the Soils and Management pages.

On the Soils page, the users may add new soil(s). Additionally, users may verify or delete the soils returned by the SSURGO database for their field. Users are also asked to indicate the soil P content for the field.

On the Weather page, the users may select the source of weather information, as well as the length of simulation.

On the Management Scenarios page, users can create and name one or more management scenarios for the field. Each management scenario must be further defined in the Operations and Conservation Practices sub-project pages. Once the management scenario(s) has been defined, users may also simulate the scenario(s) by selecting the box next to the scenario name and clicking “Simulate”.

On the Operations page, users can create the crop schedule and define management for the given field management scenario.

On the Structural Conservation Practices page, users may indicate the conservation practices that are in place on the field for the given field management scenario.

On the Results page, users can view and compare results of up to three management scenarios for a given field in tabular or graphical presentations. In addition, a PDF-formatted report for the project and results summary will be available for download.

On the Field Routing page, users are able to create and name field routing scenarios. This can also be used for simulating different scenario(s) in multiple fields or subbasins within a watershed. A routing scenario will route runoff, sediment, and nutrients from one field to the next (within a subbasin and from a subbasin to the next if used for a watershed) in the specified order. For each routing scenario, users will need to list the field-scenario order.


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Help Page

This page helps the user to navigate various tools in this website. The user can learn about NTT and its fuctions, which are built into the website, by clicking various topics listed in the page.
About NTT: This Page provides basic concept about NTT.
Contact Information: This page provides contact informations if any question or support.
System Requirements: This page provides information on what requirements user should have inorder to run NTT.
Navigation Basics: This page provides navigation on various other pages linked on this website.
Project Page: This page provides information on the Project screen.
Location Page: This page provides information on the Location screen.
Fields Page: This page provides information on the Fields screen.
Soils Page: This page provides information on the Soils screen.
Weather Page: This page provides information on the Weather screen.
Management Page: This page provides information on the Management screen.
Watershed Page: This page provides information on the Watershed screen.
Simulation Page: This page provides information on the Simulation screen.
Results Page: This page provides information on the Results screen.
APEX Files Page: This page provides information on making modifications and downloading APEX folder.
APEX: This page provides information on APEX.
NTT Disclaimer: This page is about NTT Disclaimer.

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NTT References

Gassman, P. W., Williams, J. R., Wang, X., Saleh, A., Osei, E., Hauck, L. M., Izaurralde, R. C., Flowers, J. D. (2010). The Agricultural Policy/Environmental eXtender (APEX) model: An emerging tool for landscape and watershed environmental analyses. Transactions of the ASABE.


Tuppad, P., Santhi, C., Wang, X., Williams, J. R., Srinivasan, R., & Gowda, P. H. (2010). Simulation of conservation practices using the APEX model. Applied Engineering in Agriculture


Saleh, A., Gallego, O., Osei, E., Lai, H., Gross, C., & McKinney, S. (2010). Development and Application of a Modified NTT Tool for Water Quality Trading. In 21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica (p. 1). American Society of Agricultural and Biological Engineers.


Saleh, A., Gallego, O., Osei, E., Lal, H., Gross, C., McKinney, S., & Cover, H. (2011). Nutrient Tracking Tool—a user-friendly tool for calculating nutrient reductions for water quality trading. Journal of Soil and Water Conservation, 66(6), 400-410.


Saleh, A., Osei, E., & Gallego, O. (2012). Evaluating Nutrient Tracking Tool(NTT) and simulated conservation practices. In 21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, May 27-June 1, 2012, Bari, Italy (p. 1). American Society of Agricultural and Biological Engineers.


Lal, H. (2014). The Nutrient Tracking Tool--A Historical Perspective and a Look to the Future. Resource Magazine, 21(3), 20-23.


Saleh, A., Gallego, O., & Osei, E. (2015). Evaluating nutrient tracking tool and simulated conservation practices. Journal of Soil and Water Conservation. https://doi.org/10.2489/jswc.70.5.115A.


Saleh, A., Osei, E., & Gallego, O. (2015). Evaluating Nutrient Tracking Tool and simulated conservation practices. Journal of Soil and Water Conservation. 115AJULY/AUGUST 2015 —VOL. 70, NO. 4


Burnett, J. R. (2015). Validation and verification of the Nutrient Tracking Tool for Yakima County, Washington. Tarleton State University.


Saleh, A., Niraula, R., Gallego, O., Osei, E., & Kannan, N. (2017, December). Nutrient Tracking Tool-A user-friendly tool for evaluating the water and air quality and quantity as affected by various agricultural management practices. In AGU Fall Meeting Abstracts.


Saleh A. and Edward Osei. 2018. Precision and water quality markets. Book chapter. Precision conservation. Agronomy Monograph. Pp.313-339.


Saleh, A., Niraula, R., Marek, G.W., Gowda, P.H., Brauer, D.K., Howell, T.A. 2018. Lysimetric evaluation of the APEX Model to simulate daily ET for irrigated crops in the Texas High Plains. Transactions of the ASABE. 61(1):65-74. https://doi.org/10.13031/trans.11938.


Nelson, A. M., Moriasi, D. N., Talebizadeh, M., Tadesse, H. K., Steiner, J. L., Gowda, P. H., & Starks, P. J. (2019). Comparing the Effects of Inputs for NTT and ArcAPEX Interfaces on Model Outputs and Simulation Performance. Journal of Water Resource and Protection, 11(5), 554-580.


Guo, T., Confesor Jr, R., Saleh, A., & King, K. (2020). Crop growth, hydrology, and water quality dynamics in agricultural fields across the Western Lake Erie Basin: Multi-site verification of the Nutrient Tracking Tool (NTT). Science of The Total Environment, 138485.

User Manuals and Technical Documentation


NTT/User Manual

NTT Technical Documentation

Economic Technical Documentation

APEX User Manual
  • Site Validation Experimental (Farm)

    Verification of APEX Parameters and NTT for Minnesota
    NTT Comparison to COBS Iowa
    Crop growth, hydrology, and water quality dynamics in agricultural fields across the Western Lake Erie Basin: Multi-site verification of the Nutrient Tracking Tool (NTT)

  • State Level Validation

    Alabama
    Arizona
    Arkansas
    California
    Colorado
    Delaware
    Georgia
    Idaho
    Illinois
    Indiana
    Iowa
    Kentucky
    Michigan
    Minnesota
    Mississippi
    Missouri
    Montana
    Nevada
    New Hampshire
    New Mexico
    New York
    North Carolina
    Ohio
    Oklahoma
    Oregon
    Pennsylvania
    Rhode Island
    South Carolina
    South Dakota
    Tennessee
    Texas
    Utah
    Vermont
    Virginia
    West Virginia
    Wisconsin
    Wyoming

Contact Information

For questions or comments regarding the Nutrient Tracking Tool (NTT), please contact:

  • Ali Saleh
  • Executive Director
    P.O. Box T410
    Tarleton State University
    Stephenville, TX 76402
    (254)-968-9079 (Phone)
    (254)-968-9790 (Fax)
    saleh@tarleton.edu

For technical questions or comments regarding the Nutrient Tracking Tool (NTT), please contact:

  • Oscar Gallego
  • IT Manager II
    P.O. Box T410
    Tarleton State University
    Stephenville, TX 76402
    (254)-968-9787 (Phone)
    (254)-968-9790 (Fax)
    gallego@tarleton.edu