The Long-Term Agroecosystem Research (LTAR) Network

We are a growing research network focused on developing national strategies that respond to the agricultural challenges of the 21th Century: food security and climate change.

The LTAR Network is a partnership among 18 premier long-term research sites across the United States.

The Network has a multifaceted focus on satisfying increasing demand for agricultural commodities, protecting the quality of the environment, and enhancing the quality of life in rural areas and the Nation as a whole.

Who We Are

The LTAR Network is a growing group of researchers focused on finding solutions that maintain or increase agricultural productivity, environmental quality, and people well-being in spite of pressures such as climate change.  Read more

Our Research Approach

The LTAR network combines strategic research projects with common measurements on multiple agroecosystems (croplands, rangelands, and pasturelands) and develops new technologies to address local and national challenges and opportunities.
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Data Access

LTAR scientists are responsible for managing a rich legacy of data spanning over seventy years for many sites. Collectively, it is estimated LTAR manages [200+ terabytes] of data.
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The 18 LTAR Network Sites

The 18 LTAR Network Sites collaborate in coordinated strategic research that leverages a rich legacy of research and data collection. Read more

(Click dots to open LTAR site page)

LTAR Network Tweets ( @USLTAR )

Job Announcement: Research Microbiologist - Research Associate in Mandan, ND

Job Announcement: Research Animal Scientist at Food Systems Research Unit, in Burlington, VT

Job Announcement: Research Soil Scientist at LCB site

KBS LTAR researchers show in new Global Change Biology paper how land-based climate mitigation that integrates both management and bioenergy solutions can together capture 50% more carbon than either alone @kbsltar

Thanks to a multi-million dollar partnership between @USDA_NRCS and @USDA_ARS, a team of researchers led by Steven Mirsky will build national web-based cover crop decision tools that inform species selection, seeding rates, economics, and water and nitrogen management.

As part of an @USDA_ARS, @USDA_NRCS interagency partnership, ARS Research Ecologist Steven Mirsky shares the importance of deep soil sampling rigs to ARS’s national LTAR network for tracking how long-term crop and soil management influences soil carbon storage.

Happy 110th Birthday @theJornada! @USLTER @USLTAR

A recent study highlights a novel social network approach and perspectives on resolving excess manure challenge across local, regional, and national scales @GwendwrMeredith @UNLSNR @USLTAR @USDA_ARS

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Vials everywhere! Working with student Summer Bjorn on inventorying a decade of plant tissue and #grain samples! ⁦@USDA_ARS⁩ ⁦@USLTAR⁩ ⁦@cafnr⁩

2021 ARS Discoveries Announcement: Research addressing important agroecosystem problems at 7 LTAR sites was recognized #USLTAR

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The USDA Agricultural Research Service (ARS) Long-Term Agroecosystem Research network consists of 18 Federal and university agricultural research sites with an average of over 50 years of history. The goal of this research network is to ensure sustained crop and livestock production and ecosystem services from agroecosystems, and to forecast and verify the effects of environmental trends, public policies, and emerging technologies.