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Ethanol 'Leftover' Has Weed-Fighting Potential

Date:
May 23, 2007
Source:
USDA, Agricultural Research Service
Summary:
Distiller's dried grains (DDGs) -- byproducts of converting corn into ethanol -- are usually fed to livestock. But a new use could be on tap: fighting weeds and reducing herbicide use. That's the hope of scientists seeking to identify new, value-added uses for farm-based commodities like DDGs and help bring them to commercial fruition by developing novel processing technologies.

A typical ethanol plant in West Burlington, Iowa.
Credit: Steven Vaughn

Distiller's dried grains (DDGs)—coproducts of converting corn into ethanol—are usually fed to livestock. But a new use could be on tap: fighting weeds and reducing herbicide use.

That's the hope of plant physiologist Steve Vaughn and colleagues with the Agricultural Research Service (ARS) in Peoria, Ill. There, at the National Center for Agricultural Utilization Research (NCAUR), Vaughn is among approximately 100 scientists seeking to identify new, value-added uses for farm-based commodities like DDGs and help bring them to commercial fruition by developing novel processing technologies.

In laboratory, greenhouse and field studies over the past few years, Vaughn has shown that applying DDGs to soil as a surface mulch can not only suppress weeds, but also bolster the growth of tomatoes and some turfgrasses. In one study, for example, Roma tomatoes in DDG-treated plots yielded 226 pounds, versus 149 pounds from untreated control plots.

Vaughn attributes some of the increase to nitrogen, phosphorus and other nutrients released by the DDG mulch as it decayed.

In another study, using various analytical methods, NCAUR collaborator Mark Berhow is seeking to identify, measure and monitor the activity of the chemicals in the DDG mulch that may have kept chickweed, annual rye and other weeds from germinating.

Rick Boydston, an ARS collaborator at Prosser, Wash., tested the mulch's weed control in potted ornamentals, including roses. He observed that DDGs worked best when applied to the soil surface, because mixing them into the soil harmed both ornamentals and weeds alike.

On another front at Peoria, ARS chemist Rogers Harry O'Kuru is examining DDGs for phytosterols, lecithin and other substances with potential use as health-promoting food ingredients.

The team's efforts to expand the market for DDGs are timely. In the Midwest, ethanol producers generate 10 million tons of DDGs annually. Farmers buy most of it for about $80 per ton and feed it to cows and other ruminants. However, the nation's increasing production of ethanol may create a DDG surplus that exceeds the current demand, Vaughn notes.


Story Source:

The above story is based on materials provided by USDA, Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA, Agricultural Research Service. "Ethanol 'Leftover' Has Weed-Fighting Potential." ScienceDaily. ScienceDaily, 23 May 2007. <www.sciencedaily.com/releases/2007/05/070522134713.htm>.
USDA, Agricultural Research Service. (2007, May 23). Ethanol 'Leftover' Has Weed-Fighting Potential. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2007/05/070522134713.htm
USDA, Agricultural Research Service. "Ethanol 'Leftover' Has Weed-Fighting Potential." ScienceDaily. www.sciencedaily.com/releases/2007/05/070522134713.htm (accessed September 20, 2014).

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