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 )

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

3 exciting new papers from @TheJornada @NMSUaes @USDA_ARS :
@USLTAR common grazingland indicators:
Crop phenology classification via deep learning:
Heritage cattle landscape use via GPS collars:

Wind erosion is a critical problem in #rangeland ecosystems that we have not been able to measure adequately until now: the AERO model estimates effects of #climatechange and land management on erosion rates. @TheJornada @NMSUaes @USLTAR @USDA_ARS

New in @ESAApplications:

Predicting spatial-temporal patterns of diet quality and large herbivore performance using satellite time series

With #OpenData in @USDA's #AgDataCommons

#Rangelands #Grasslands #RemoteSensing

@USDA_ARS @USLTAR @Kearney_Sean_P

A nice shot of the @NEON_sci tower @TheJornada and here are @theAGU abstracts from this research site from @USLTER @USLTAR @CZCNet


We're thrilled to be participating in @theAGU's Fall Meeting once again this year! Tune in this week to see @NEON_sci's presentations, posters, and more. Check back here for event updates and highlights!
Learn more about NEON at #AGU21:

@LICOR_ENV @USLTAR @SchreinerMcGraw Tucker Prairie is a half hour east of Columbia. Details here:

We are able to use this site to compare with @USLTAR row crop experiments located an hour away. We are assessing capacity for carbon sequestration from non-cultivated prairie.

Welcome Dr. Sarah McCord @mccord_se to her role as a Research Ecologist with USDA ARS Jornada unit. Sarah develops computational approaches to use continental-scale, field monitoring and other datasets to understand ecosystem change in #rangelands. @USLTAR

A new preprint where I use deep learning models to track crop phenology in @PhenoCam images. Its tricky, and took a lot of trial and error the past 18 months to figure out. 1/2


This new soil moisture product will be useful for explaining patters in #rangeland production, phenology, and restoration datasets. Take a look @dataEcologist @phenophase @mccord_se @TheJornada @USLTAR @LDN2030

Noemi Vergopolan@NVergopolan

I am excited to announce SMAP-HydroBlocks:

The first #satellite-based surface #SoilMoisture dataset at 30-m resolution for the United States

Data is #OpenAccess and peer-review paper is available @ScientificData

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Long-term network research for the next agricultural revolution @USLTAR @USDA_ARS

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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.