anks are tightening credit for U.S. farmers amid a rise in delinquencies, forcing some growers to turn to alternative sources of loans. When U.S. agriculture was booming this decade, banks doled out ample credit to strong performers and weaker growers alike, said Michael Swanson, an agricultural economist at Wells Fargo & Co. But with the farm slump moving into its third year, banks have become pickier, requiring some growers to cough up more collateral and denying financing outright to some customers who need it to pay for seeds, crop chemicals and rent. Farmers this year have been grappling with low commodity prices, mounting debt and weaker incomes. With traditional bank loans harder to come by, farmers are turning to sources like CHS Inc., a large farmer-owned cooperative in the U.S., which operates grain elevators and retail stores across the Midwest. CHS said its loans to farmers increased 48% in both number and volume in the 12 months to March and have more than doubled since 2014.