U.S. soybean futures jumped to a 1-1/2-week high on Friday and posted their first weekly gain in a month, lifted by technical buying and short-covering amid concerns that dry U.S. Midwest weather would limit crop production.U.S. soybean futures jumped to a 1-1/2-week high on Friday and posted their firs... GRAINS-Soy firm, corn mixed ahead of USDA report; dry U.S. weather stokes yield concern - Agricultural Commodities - Reuters