DES MOINES, Iowa — Two new technologies offer the promise that corn growers could turn their cobs into cash.

Cobs, the refuse left behind after harvest, are now plowed back into fields. But companies from California and South Dakota plan to start changing that by building two plants in Iowa, one to turn the material into ethanol and another to produce fertilizer.


...Poet spokesman Nathan Schock said the company hasn't yet figured out how much it will pay farmers, but it could be $30 to $60 per ton for corn stover, which includes cobs and some stalk. An average acre in Iowa yields about 1.5 tons of corn stover.

The company's payments to farmers could be supplemented by the federal government through the Biomass Crop Assistance Program.

...Meanwhile, San Francisco-based SynGest, Inc., plans to build an $80 million facility in Menlo, about 40 miles west of Des Moines, that will be the first to make ammonia fertilizer from corn cobs.

The plant, expected to be completed by fall 2011, will process 130,000 tons of cobs per year into 50,000 tons of fertilizer, or enough for 100,000 acres of corn, SynGest CEO Jack Oswald said. Farmers would get about $50 per ton of cobs.