Soybeans increased on Friday heading to its largest weekly gain in four months amid signs of sustained demand for the U.S. crop from the world's largest user of the commodity, China. July soybeans futures jumped by 0.6% to $14.36 a bushel on the CBOT, the strongest level for the most-active futures contract since March 28, and it was traded at $14.3175 as of 1:03 p.m. in Singapore.