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Health and Life Science

WSU Researcher Seeks New Uses for Cull Potatoes

PULLMAN, Wash. -- A Washington State University scientist is trying to turn cull potatoes into a profitable byproduct for Washington potato growers.

The state's potato growers harvest about 5 million tons of potatoes every year. Nearly 15 percent of the potatoes, usually known as culls, end up as some form of feed or residual use by-product, according to Melvin Martin of the J.R. Simplot Company.

Culls cannot be sold on the fresh market or processed into french fries or other potato products because they do not meet minimum size, grade or quality standards. Culls often are sent on for further processing, fed to cattle or added to compost piles. Potatoes cost about $70 to $120 per ton to grow while growers generally receive less than $10 a ton for their culls, according to Martin.

Potato processing in the state of Washington also generates waste in the form of solids, peels, unusable potato parts and wastewater. An average processing plant can produce between 1.5 and 3 million gallons of wastewater daily, according to Don Nichols of the Washington Department of Ecology.

Click for full story from WSU News Service.

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