The new U.S. farm bill might violate World Trade Organizationrules against trade-distorting subsidies, major U.S. business groups said in an appeal to revamp the bill, which is already facing slim odds of passage.

Hundreds of U.S. farm and agribusiness groups have urged Republican leaders in the House to try again to pass the $500 billion, five-year farm bill that suffered an historic and unexpected defeat in June.

Republican budget-cutters joined Democratic defenders of food stamps to deal a shocking defeat to the $500 billion farm bill backed by Republican House leaders.

The U.S. government has ordered crop insurers to charge lower premiums to soybean growers for the second year in a row as part of rate revisions for six major crops, even as many farmers collect on claims following this year's severe drought.