is part of the Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

  • American Agriculturist
  • Beef Producer
  • Corn and Soybean Digest
  • Dakota Farmer
  • Delta Farm Press
  • Farm Futures
  • Farm Industry news
  • Indiana Prairie Farmer
  • Kansas Farmer
  • Michigan Farmer
  • Missouri Ruralist
  • Nebraska Farmer
  • Ohio Farmer
  • Prairie Farmer
  • Southeast Farm Press
  • Southwest Farm Press
  • The Farmer
  • Wallaces Farmer
  • Western Farm Press
  • Western Farmer Stockman
  • Wisconsin Agriculturist
SaturatedBufferInstallationNRCSPhoto800.jpg NRCS

Are saturated buffers effective?

Ag Drainage Management Coalition and FSA research find that saturated buffers are a low-risk option to reach nutrient removal goals.

Do saturated buffers work?

The Farm Services Agency and the Agricultural Drainage Management Coalition collaborated to quantify the effectiveness of saturated buffers to reduce nutrient loading from tile drainage waters. This demonstration program builds upon this same group of collaborator’s findings from the 2012-2015 and 2016-2017 projects.

FSA has made significant investments through the Conservation Reserve Program at addressing nutrients, specifically nitrogen, reaching America’s surface waters through the riparian buffer programs. Riparian buffers have been shown to be effective at removing nitrogen from surface flows, as well as shallow subsurface ground water, but in the tile-drained landscape of the Midwest, a significant portion of the nitrogen lost from agricultural fields does not have the opportunity to interact with the carbon rich buffers. The goal of a saturated buffer system is to hydrologically reconnect a subsurface drainage outlet with an edge-of-field buffer. This practice takes advantage of both the denitrification and plant nutrient uptake opportunities that are known to exist in buffers with perennial vegetation.

ADMC worked with FSA to monitor seven Midwest saturated buffer sites distributed throughout Iowa, Illinois, and Minnesota from October 2017- August 2018.

What did they find?

  • The seven saturated buffers had an average nitrate-N concentration reduction ranging from 41% to 98% during the monitoring period. Nitrate load reductions ranged from 10 pounds to 194 pounds.
  • $3,584 was the average installation cost of the seven monitored saturated buffers, and they have operated at an efficiency of $1.22/pound of N removed over the 20 collective site years of monitoring.
  • With a median $/lb. N removed value of $1.22, saturated buffers are one of the most cost-efficient nitrogen removal practices.
  • The relatively low installation costs, long expected lifespan, and minimum maintenance makes the practice a low risk option to reach nutrient removal goals.

Going forward

ADMC also contracted with the Department of Crop Sciences from the University of Illinois, Urbana-Champaign to develop a decision support tool to identify sites that will likely provide cost-effective locations for saturated buffer installations in the Midwest. This step-wise model revealed a conservative estimate of 46,920 miles of cumulative stream bank suitable for saturated buffers.

This study once again exhibited that saturated buffers are a cost-effective method in removing nitrogen. The developed decision support tool exhibited, in a conservative manner, that saturated buffers could potentially be installed to treat nearly 9.5 million acres of tile-drained Midwest land and remove 5% to 10% of the tile contributed nitrate-N load or 2-5% of the overall load delivered to the Gulf of Mexico. Enhancing a standard buffer with a saturated buffer where possible could remove approximately 13 times the annual amount of N, while making the practice six to ten times more efficient in terms of $/lb. of N removed.

To view the full research report and find additional information and videos pertaining to saturated buffer systems, visit www.saturatedbufferstrips.com.

Source: Agricultural Drainage Management Coalition, which is solely responsible for the information provided and is wholly owned by the source. Informa Business Media and all its subsidiaries are not responsible for any of the content contained in this information asset.
Hide comments

Comments

  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
Publish