By Chris Kick Rising prices for diesel fuel, fertilizer and other farm inputs continue to strain the agricultural sector at planting season. According to the U.S. Energy Information Administration, the average price for a gallon of gasoline in the U.S. is up more than a dollar per gallon compared to last year, and U.S. on-road diesel prices are up more than $2, for an average of $5.64. Most off-road diesel prices are slightly under $5 a gallon.