GRAINS-Corn rebounds to end volatile week

* Corn strengthens after pausing near 8-year high

* Market assesses U.S. planting, drought threat to Brazil crops

* Wheat lower after tracking corn rally this month

* Soybeans follow corn higher (New throughout; updates byline, previous dateline PARIS/CANBERRA)

By Christopher Walljasper

CHICAGO, April 30 (Reuters) - Chicago corn and soybean futures rose on Friday after three days of volatile trade following a run-up to eight-year highs, traders said.

Wheat eased, pressured by a strengthening dollar, despite persistent dryness across the U.S. Plains that supports the complex.

The most-active corn futures on the Chicago Board of Trade gained 18 cents at $6.66-1/2 per bushel by 12:03 p.m. (1803 GMT).

CBOT soybean futures rose 19 cents to $15.21-1/4 per bushel. CBOT wheat dipped 1-3/4 cents to $7.27-1/2 per bushel.

"The volatility we've seen is probably going to continue into next week, given that this week's cooling off period hasn't left us with many answers," said Dan Hussey, senior market strategist at Zaner Group.

A chilly start to the growing season in the U.S. Midwest and drought in southern Brazil have exacerbated worries about global supply as Chinese demand remains strong.

Expected rain should improve moisture for early corn growth in the United States in the next two weeks, although cool temperatures could slow germination, the Commodity Weather Group said in a note.

"Weather is the main focus, going forward," said Mike Seery, president of Seery Futures, noting that uncertainty should be supportive to both corn and soybeans. "The commodity markets are just on fire."

Wheat eased but remained in a tight range after climbing to an eight-year high on Tuesday, as a strengthening dollar added pressure to the grain in the world market.

"The rise in the U.S. dollar the last couple days is weighing on the wheat market, at least in the short term," said Hussey. "Global wheat buyers aren't willing to pay these high prices, for Black Sea wheat or U.S. wheat." (Reporting by Christopher Walljasper; additional reporting by Gus Trompiz in Paris and Colin Packham in Canberra)

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