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Thank you for using NTT (version G2) program. As NTT users, we would like to inform you that NTT (version NTTG2) no longer will be available nor supported by NTT development team as of March 15, 2019. We are now supporting two new versions of NTT (NTT.TIAER.TARLETON.EDU for common users and NTT-RE.TIAER.TARLETON.EDU for researches and educators) with latest updates available for your use. We also are providing you with an “Upload project" option in our new version to transfer your NTTG2 projects. Please let us know if you have any question and/or we could be of any further assistance.
Thank you very much for using this program. The current version of “Nutrient Tracking Tool (NTT): Next generation” is designed to assess the environmental and economic impacts of various management practices on water and air quality at the field or small watershed level. The NTT is an Internet-based program and requires no software to download. NTT imports the required databases, such as weather, soil, management, and land geometry at the selected land (agricultural, forestry, and urban) for the user using the existing GIS and non-GIS based database anywhere in the mainland United States. The NTT simulates the baseline and numerous conservation management scenarios using the APEX (Agricultural Policy/Extender; Williams et al. 2010) (Version 0806) model. Please review “about NTT” section for information regarding the new functions and science in current version of NTT. For detailed information please refer to the manual or contact Dr. Ali Saleh by e-mail at or by phone (254) 968-9799.

1. Although the database in NTT available for mainland USA, access to the databases for NTT simulation is limited to where the NTT has been tested and verified. This assure the users that results obtained from this version of NTT is relatively reliable for the conditions where the program has been verified. However, the last version of NTT ( allows the users to access the data throughout the mainland US.
2. This version of NTT is written both in English and Spanish languages.

Finally, as the NTT project leader and behalf of all of my project team (Oscar Gallego and Edward Osei), I would like to thank the funding sources and our colleagues, in particular the farmers and producers, for their contribution in designing this program.

Dr. Ali Saleh