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United States Department of Agriculture

Agricultural Research Service

Long-Term Agroecosystem Research (LTAR) Network
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As the 21st century unfolds, agriculture will face a series of challenges - in the United States and globally - in providing sufficient food, fiber, and fuel to support a growing global population while our natural resources, environmental health, and available arable land decline and climate changes.  Click here to read the full version of this Abstract.

Shared Research Strategy (pdf)

2012 Request for Information (RFI) (pdf)

2011 Request for Information (RFI) (pdf)

RFI Responses & Executive Summaries for the Ten Initial Sites (pdfs):

RFI Responses & Executive Summaries for the Eight New Sites (pdfs):


ARS Site Contact Information (pdf)

           "Dense Gauge Network Confirms Improvement in TRMM Radar Rainfall Intensity Estimates"


Organizations currently collaborating with one or more Long-Term Agro-ecosystem Research (LTAR) network sites (pdf)


Current LTAR Sites by Farm Source Regions




Last Modified: 2/23/2015