Soybean prices also climbed in part of speculation that demand for U.S. crops could increase if supply disruptions in Brazil and Argentina slow shipments. Speculation that an earlier work stoppage by truckers in Brazil could be revived helped lift prices. "People are concerned that port loadings in Brazil will be slow" and the advancing Brazilian harvest combined with trucker protests there already had combined to increase vessel line-ups along Brazil's coast, potentially delaying exports. May soybean rose 8 1/4 cents, or 0.8%, to $9.92 3/4 a bushel.