GRAINS-Crop prices rise as more U.S. rains threaten yields

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* Corn futures rise after falling to one-week low

* Investors assess fallout of rain-hit U.S. planting season

* Rising U.S. corn prices cool export demand (Updates with U.S. trading; changes byline, dateline, pvs PARIS/SINGAPORE)

CHICAGO, June 20 (Reuters) – U.S. grain and soybean futures jumped on Thursday on concerns over persistent rains threatening crop yields, after wet weather already prevented American farmers from planting millions of acres of corn this spring.

Forecasts call for more rain in the U.S. Midwest over the next five days, which would keep some fields too wet to plant and add stress to planted crops that are in early growing stages, analysts said.

The weather problems heap more worries on a farm sector that has suffered from years of low crop prices and a U.S.-China trade war that is slowing agricultural exports.

“We have a market that’s buying the breaks based on the concerns that are created by adverse weather in the U.S.,” said Arlan Suderman, chief commodities economist for INTL FCStone.

The most-active corn contract on the Chicago Board Of Trade (CBOT) was up 1.5% at $4.47-3/4 a bushel by 12:16 p.m. CDT (1716 GMT). Technical buying helped lift prices after the contract dropped to a one-week low of $4.36-1/2 earlier in the session traders said.

The market touched its highest since June 2014 at $4.64-1/4 on Monday, after unrelenting rain led to unprecedented delays in corn planting.

CBOT soybeans rose 1.4% to $9.15-3/4 a bushel, while CBOT wheat gained 1.1% to $5.27-3/4 a bushel.

A sharp fall in the U.S. dollar helped support the grain markets as it makes dollar-priced commodities cheaper overseas.

Yet recent gains in corn prices have reduced export demand, traders said.

Weekly export sales of U.S. corn totaled 399,200 tonnes, near the low end of market forecasts for 300,000 tonnes to 900,000 tonnes, according to the U.S. Department of Agriculture.

Soybean export sales came in at 771,600 tonnes for the week, near the high end of expectations for 200,000 tonnes to 800,000 tonnes. Export sales of wheat totaled 187,600 tonnes in the latest reporting week. Analysts’ forecasts for weekly wheat export sales had ranged from 200,000 to 500,000 tonnes.

“The U.S. is again one of the highest priced sources of commodities in the global market,” said Karl Setzer, senior market analyst at Growmark. “This is especially the case for corn where the US is showing interest in importing corn from other suppliers.”

The soybean market, which is relies on demand from top-importer China, will be focused on next week’s G20 summit. U.S. President Donald Trump and Chinese counterpart Xi Jinping are expected to meet and discuss the trade dispute that has slowed American soy exports. (Additional reporting by Gus Trompiz in Paris and Naveen Thukral in Singapore; editing by Diane Craft)