Updates prices at 0648 GMT; adds background throughout

KUALA LUMPUR/BEIJING, July 7 (Reuters) - Chicago Board of Trade soybean futures rose for a second session on Tuesday, supported by renewed Chinese buying of U.S. soybeans and firmer crude oil prices.

The most-active CBOT soybeans contract Sv1 climbed 0.13% to $11.93-3/4 a bushel by 0647 GMT.

China's state-owned trader COFCO bought at least five cargoes, or at least 300,000 metric tons, of U.S. soybeans on Monday for shipment between September and November, two U.S. traders with knowledge of the deals told Reuters.

Traders are monitoring China's progress toward buying the 25 million metric tons of U.S. soybeans that the White House said the Asian nation committed to purchase.

Higher crude oil prices also lent support to soybeans and corn because of their roles in biofuel production.

Brent crude futures LCOc1 gained 38 cents, or 0.5%, to $72.37 a barrel, while U.S. West Texas Intermediate crude CLc1 rose 30 cents, or 0.4%, to $68.85 a barrel as of 0350 GMT, after settling down at around pre-Iran war levels on Monday. O/R

Corn Cv1 dipped 0.16% to $4.57 a bushel, after hitting a one-month high in the previous session on weather worries in the U.S. Midwest and Europe.

Wheat Wv1 fell 0.41% to $6.11-1/2 a bushel, pressured by ongoing harvest in the northern hemisphere and ample global stocks.

Robust export demand limited losses. Saudi Arabia purchased 661,000 metric tons of wheat in its fourth tender this year, the General Food Security Authority said.