NOTICE: ltar.nal.usda.gov (this site) will be retired on May 31, 2021.
Please use the new LTAR site at ltar.ars.usda.gov instead. Please also update your bookmarks and references.

System maintenance in progress. GIS map is not currently available. Other data and links are available.

Notice: This site will be undergoing scheduled maintenance beginning Friday, April 17 at 9:00 pm EDT until sometime Saturday morning, April 18. The site may be unavailable during this period. We apologize for any inconvenience.

Long-Term Agroecosystem Research Data Overview

The USDA Agricultural Research Service (ARS) Long-Term Agroecosystem Research (LTAR) network consists of 18 Federal and university agricultural research sites with an average of over 50 years of history. LTAR was established to build the knowledge required for sustainable intensification of agriculture, increasing yields from the current agricultural land base while minimizing or reversing agriculture’s adverse environmental impacts.

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