(Rewrites throughout with U.S. market open, adds quote, updates prices, adds byline, changes dateline from PARIS/CANBERRA)

CHICAGO, April 2 (Reuters) - U.S. corn futures dropped on Tuesday on forecasts for good spring planting weather, which eased concerns about a lower-than-expected acreage outlook from the U.S. Department of Agriculture (USDA) last week.

Soybeans firmed on rallying soyoil and worries that an expansion of corn planting could reduce acres devoted to soy planting in the United States.

Wheat futures fell after the USDA reported winter crop conditions at the highest in five years and as more rain is forecast for the Plains farm belt in the next 10 days.

Grain traders are monitoring Midwest weather forecasts as planting season nears to gauge whether the government's acreage outlook released late last week will shift.

The USDA pegged U.S. corn acres well below expectations, and favorable planting weather could trigger an expansion of seedings.

"We've got more moisture in the Midwest and a warming trend into the next week," said Don Roose, president of U.S. Commodities.

Normal to above-normal rains are expected in much of the Midwest corn belt in the six to 10 day period, followed by a drier pattern that could accelerate seeding, according to a Commodity Weather Group forecast.

Chicago Board of Trade May corn fell 6-1/2 cents to $4.29 a bushel by 10:43 a.m. CDT (1543 GMT), while May soybeans rose 2 cents to $11.87-3/4 a bushel.

CBOT May wheat fell 11-3/4 cents to $5.63-3/4 a bushel.

In its first national crop progress report since before winter, the USDA on Monday rated 56% of the U.S. winter wheat crop in good-to-excellent condition.

That was below average trade expectations but above a pre-winter score of 50% and the highest for this time of year since 2019.

Strength in the dollar, which on Tuesday set another 4-1/2 month peak against a basket of major currencies, was denting the export competitiveness of wheat and other U.S. crops.

(Additional reporting by Gus Trompiz in Paris and Peter Hobson in Canberra; Editing by Subhranshu Sahu, Mrigank Dhaniwala, Ravi Prakash Kumar and Susan Fenton)