CHICAGO, Sept 18 (Reuters) - Chicago soybean futures extended their bull run on Friday, setting a two-year top as top global buyer China continued with daily purchases of U.S. soybeans.

Wheat futures surged more than 3% on fears of tightening supplies from key exporters, and corn futures rose for a third straight session.

As of 12:52 p.m. CDT (1752 GMT), Chicago Board of Trade November soybeans were up 15-3/4 cents at $10.44-1/4 per bushel after reaching $10.46-3/4, a contract high and the loftiest price on a continuous chart of the most-active soybean contract since May 2018.

CBOT December wheat was up 17 cents at $5.73-1/4 a bushel and December corn was up 3-1/4 cents at $3.78-1/2 a bushel.

Soybeans have risen in 17 of the last 19 sessions and were on track for a sixth straight weekly advance, buoyed by a streak of daily Chinese purchases of U.S. soybeans.

The U.S. Department of Agriculture confirmed U.S. soy sales to China in each of the last 11 business days, including Friday's announcement of 132,000 tonnes. The USDA also reported sales of 210,000 tonnes of U.S. corn to China and 100,000 tonnes of soymeal to unknown destinations.

"China had a whole industry devoted to taking food waste and feeding it to hogs, and that's illegal now. So they are rebuilding their herds, and they are having to do it with corn and soybean meal," said Jim Gerlach, president of Indiana-based A/C Trading.

As it rebuilds its massive hog herd following a devastating outbreak of African swine fever, China is also looking to fulfil commitments in a trade pact with the United States and avert tensions in food supply, analysts said.

In wheat, the CBOT December contract hit a 5-1/2 month high on worries about dry weather curbing crops in Argentina, Europe and the Black Sea region.

"Those are three pretty big exporters of wheat," Gerlach said.

The number of wheat fields in northern Argentina that will not be harvested due to drought is growing, the Buenos Aires Grains Exchange said on Thursday.

Traders were also assessing news that Algeria moved to open its wheat purchase tenders to Russian and Ukrainian grain. (Additional reporting by Gus Trompiz in Paris and Naveen Thukral in Singapore, Editing by Sherry Jacob-Phillips, Kirsten Donovan and Will Dunham)