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United States Department of Agriculture

Agricultural Research Service

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Description: The Nitrogen Index tool is designed to help nutrient managers quickly assess N loss risk related to agricultural N management. For related information not included in the user manual, as well as additional applications for the N Index, please review Delgado et al. (2006 and 2008) and De Paz et al. (2009), Escudero et al. (2014), Bolster et al. (2014) and Saynes et al. (2014).

Some of the New Features Included in This Version:

  • Fully multilingual with Spanish, English, and Portuguese
  • Two choices for measurement units: English and metric
  • Assessment of N2O emissions
  • A Tier Zero Index, which is much simpler to use
  • Can generate a graph and export results to an Excel? file
  • New indices for Malawi and Brazil added

Technical Specs: The Nitrogen Index is a tool written in the programming language Java? developed by Sun Microsystems?. To run the Nitrogen Index, the user must have the most recent version of Java installed, which can be downloaded for free from Java's website.

Latest Version: 4.5, Release date: 1/6/2015

For more detailed information of the Nitrogen Index, please see the PDF here.

  • To download the Nitrogen Index Tool - N Index 4.5, please follow this link to navigate to the download form.
  • To download the CCE Nitrogen Index Tool - N Index 4.4.1 for NRCS Users, please follow this link to navigate to the download form.


  • To view the Nitrogen Index 4.4 Manual, please follow this link or navigate to the directory where the Nitrogen Index was installed (C:/Program Files/ is the default): /USDA-ARS-SPNR/Nitrogen Index/Example Files & Manual/Nitrogen Index 4.4 User Manual.pdf
  • To view the Nitrogen Index 4.3.2 Manual, please follow this link.

Contact: Jorge Delgado

Last Modified: 9/7/2016
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