Sweet sorghum promoted as "smart" biofuel

By Deborah Zabarenko, Environment Correspondent

WASHINGTON (Reuters) - A corn-like plant that can grow as high as an elephant's eye on some of Earth's driest farmland shows promise as a "smart" biofuel that won't cut into world food supplies, an agriculture expert said on Monday.

Sweet sorghum, used in the United States mostly as animal feed, offers a 10-foot (3 meter) stalk that can be turned into ethanol without damaging the food grain that grows at its top, Mark Winslow said in an interview.

Unlike corn-based ethanol, which uses one and a half times as much energy in its production as it offers as an end product, sweet sorghum produces eight units of fuel for every unit of fuel used to make it in developing countries, Winslow said.

Even in the United States, where mechanized production uses more fuel, sweet sorghum ethanol should still have four times the energy yield of corn-based ethanol, said Winslow of the International Crops Research Institute for the Semi-Arid Tropics.

Use of corn-based ethanol also pushes up demand for this crop on international markets, cutting the supply of food grain, and that would not happen with sweet sorghum, he said.

"Sorghum isn't traded internationally, it's grown and consumed locally in dry areas," Winslow said. "Since you're producing the grain on this plant, it's not a trade-off as it is with corn."

The institute is a nonprofit, non-political organization that does agricultural research focusing on "smart crops" and production systems aimed at helping poor dry-land farmers without hurting the environment.

TEAMING WITH TATA