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GRAINS-Corn seesaws, soybeans rise on U.S. planting uncertainty

Tom Polansek

* USDA says corn planting 83% complete after delays

* Agency expected to cut U.S. yield estimates Tuesday

* Traders await results of GASC wheat tender (Adds USDA planting data, Egyptian tender for wheat, closing prices)

CHICAGO, June 10 (Reuters) - U.S. corn futures veered between gains and losses while soybean futures rose on Monday as planting delays fueled uncertainty over the size of the nation's crops.

Heavy rains delayed plantings the spring and traders remain unsure about how many acres of corn and soy will actually be planted and how much the harvests will yield.

Corn seeding is normally complete by this point in the season. But the U.S. Department of Agriculture, in a weekly crop report, said planting was 83% complete, up from 67% a week ago. The agency rated 59% of the crop as good to excellent, down from 77% a year ago.

Soybeans, which are usually planted later than corn, were 60% planted. That was up from 39% a week earlier and below the average for 88%.

Some farmers said they had given up on trying to plant corn because rain delays left them with little hope of producing big yields. Corn that is planted late in the season can suffer if there is a frost before harvest.

"Regardless of rain or no rain, not many guys are going to plant corn after the 10th of June," said Jim Gerlach, president of A/C Trading in Indiana.

Other farmers were continuing efforts to put the crop in the ground. U.S. weather firm Maxar said dry weather across the heart of the corn belt was favorable for planting still to be done.

"We're really not ready to call it done here," said Rich Nelson, chief strategist for Illinois-based broker Allendale.

The most actively traded corn contract ended flat at $4.15-3/4 a bushel at the Chicago Board of Trade.

The most-active soybean contract rose 0.4 percent to $8.58-1/2 a bushel. CBOT's most-active wheat contract gained 0.5 percent to $5.07-1/2 a bushel.

The USDA on Tuesday is expected to trim its estimates for corn and soybean yields in its monthly supply and demand report. However, some traders said the cuts will likely be too small to reflect the full impact of late planting.

Concerns about the size of the U.S. crops are a turnaround after farmers produced massive harvests over the past five years. The large supplies and a slowdown in export demand linked to the trade war with China weighed on prices before U.S. planting delays emerged.

On Tuesday, traders will also look for the results of a wheat tender from Egypt, the world's top importer of the grain.

(Additional reporting by Naveen Thukral in Singapore and Nigel Hunt in London Editing by Joseph Radford, Subhranshu Sahu, Kirsten Donovan, David Gregorio and Dan Grebler)