The Thomson Reuters/Jefferies CRB Index of 19 raw materials rose 3.25, or 1 percent, to 315.35 at 1:31 p.m. New York time. A close at that level would mark a weekly gain of 4.7 percent.
Cotton was poised for the biggest weekly jump in 39 years after India put limits on exports. Heavy rain is eroding the quality of Australian wheat after a drought cut Russian grain output. The dollar tumbled against major currencies, boosting the investment appeal of energy, metals and crops. Crude oil rose to a 25-month high, and gold topped $1,400 an ounce.