CBOT soybean futures climbed to a 20-month high on expectations of improved demand from biofdiesel manufacturers, with soybean prices supported by rising soybean oil values. Reports suggest that the U.S. plans to require large refineries to make up for at least half of the waived biofuel blending volumes, boosting demand for feedstocks such as soybean oil and strengthening market expectations. Additionally, in Brazilthe world's largest soybean producer and exportertransportation bottlenecks have emerged, with ports facing unusually lengthy shipping delays. These multiple supportive factors have strengthened U.S. soybeans, and in the short term, U.S. soybean prices are expected to maintain a firm trend.