Chicago corn rose to its highest in more than two weeks on Monday, with strong U.S. exports and concerns over flooding in key exporter Argentina boosting prices.
Soybeans and wheat also edged up as well, boosted by spillover support from the corn market.
March corn on the Chicago Board of Trade was up 0.8 percent at $3.68-1/2 a bushel at 1134 GMT after climbing earlier in the session to $3.68-3/4, the highest since Feb. 5.
"U.S. net exports nearly doubled on the previous week, albeit from a fairly low base," said Tobin Gorey, director of agricultural strategy, Commonwealth Bank of Australia in Sydney.
Corn is also drawing support from flooding in Argentina that "was a cause for concern over the weekend," he added.
The U.S. Department of Agriculture pegged weekly corn sales at more than 1 million tonnes above analyst expectations and wheat and soy sales in line with estimates.
In Argentina, six key farm provinces were declared flood emergency areas by the government on Friday, making special credit lines and tax breaks available to affected growers in the soy and corn exporting powerhouse. While its top grains producing province of Buenos Aires was not included in the emergency, floods were reported there as well.
CBOT March soybeans gained 0.7 percent to $8.84-1/2 a bushel.
"The soybean price is being pulled up by corn," Commerzbank said in a market note.
CBOT wheat prices edged up with March up a marginal 0.2 percent at $4.62-3/4 a bushel.
Dealers said the market was consolidating after falling on both Thursday and Friday last week with gains capped by concerns about rising global stocks.
March wheat in Paris was up 0.3 percent at 152.50 euros a tonne.
Commerzbank noted that farm office FranceAgriMer last week raised its forecast for total French soft wheat stocks at the end of the 2015/16 season to the highest level in 17 years.
"This is backed up by news that Egypt - the largest wheat importer - bought 240,000 tons of wheat last week, only 60,000 tons of this total being from France and 180,000 tons from Russia," Commerzbank said.