Chicago Board of Trade (CBOT) grains futures closed mixed over the trading week which ended October 13, with corn and soybean rallying over less-than-expected ending stocks.

The most active corn contract for December delivery rose 2.75 cents weekly, or 0.79 percent, to 3.5275 dollars per bushel. December wheat delivery dropped 4 cents, or 0.90 percent, to 4.395 dollars per bushel. November soybeans soared by 28 cents, or 2.88 percent, to 10.0025 dollars per bushel.

On Thursday, the U.S. Department of Agriculture (USDA) released its monthly supply and demand report. For soybeans, the U.S. ending stocks were pegged at 430 million bushels, less than the average estimate of 452 million bushels and the USDA' s September estimate of 475 million.

The bullish data pushed the soybeans prices higher with massive funds buying. CBOT floor brokers reported that on Friday alone, funds bought some 7,000 contracts of soybeans, which resulted in sending the soybeans above the 10-dollar-per-pushel level after more than two months.

The USDA pegged U.S. 2017-18 corn stocks at 2.34 billion bushels compared with the USDA' s previous estimate of 2.335 billion, indicating limited increase even following the harvest in the past month.

Also supported by positive weekly export sales, CBOT corn futures rose more than one percent during the last session this week.

The long soybean/short corn trade has become crowded and some liquidation of this spread is expected, said analysts with the AgResource Company.

As for wheat, the USDA ending stocks were estimated at 960 million bushels, which increased 2.89 percent from USDA last month's estimate of 933 million.

However, CBOT wheat rallied to sharp gains as funds covered a modest portion of their shorts heading into the weekend. Bargain buying after four consecutive declines offered more support to wheat futures.

Moreover, the CBOT wheat prices have became competitive with the Black Sea wheat, as the U.S. dollar weakened over the week.

Still, the more than 2 percent rally of wheat futures on Friday could not make up for the losses it suffered earlier this week.

It's likely that the vastness of world wheat acreage is maintaining high production and keeping prices under pressure, analysts noted.