GRAINS-Chicago prices buoyed by exports, dollar and U.S.-China talks

PARIS/BEIJING, Sept 16 (Reuters) - Chicago wheat, corn and soybean futures rose on Tuesday, supported by brisk U.S. exports, a weaker dollar before an expected U.S. interest rate cut and hopes of progress in U.S.-Chinese trade talks.

The most-active wheat contract Wv1 on the Chicago Board of Trade was up 0.8% at $5.29 per bushel by 1238 GMT. Wheat futures were rising for a fourth session as they recovered from contract lows last week.

On Monday, the U.S. Department of Agriculture reported weekly export inspections of U.S. wheat at 755,073 metric tons, well above trade estimates.

Competitive pricing from U.S. suppliers and delays in shipments from the Black Sea have prompted Asian flour millers to ramp up imports of U.S. wheat, according to grain traders.

News that Russia, the world's largest wheat exporter, will nearly triple its wheat export duty from September 17 has also boosted the prospects of rival suppliers.

A fall in the dollar index =USD to a two-month low, as investors anticipated the U.S. Federal Reserve will kick off a series of rate cuts on Wednesday, helped maintain the export competitiveness of U.S. grain. FRX/

"Investors are feeling very optimistic ahead of tomorrow's Fed policy decision," Peak Trading Research said in a note, adding a dovish tone in the central bank's comments could further weaken the dollar and support agricultural futures.

CBOT corn Cv1 gained 0.8% to $4.26-3/4 a bushel, while soybeans Sv1 added 0.7% to $10.49-3/4 per bushel.

Monday's weekly export inspections data also showed a bigger than anticipated corn volume.

Strong export demand has helped corn prices hold up in the face of a record expected U.S. harvest getting under way.

Doubts over how strong U.S. yields will turn out have also lent some support. Weekly USDA data on Monday showed weaker crop ratings for corn and soybeans.

The soybean market drew comfort from news of a call to be held between U.S. President Donald Trump and Chinese President Xi Jinping this Friday.

China, the world's top soy buyer, has so far avoided U.S. supplies for the 2025/26 crop year as the countries remain locked in a trade dispute.

"Over the next few days, we will most likely be moving sideways and if no deal emerges, we will revisit the recent lows," said Ole Houe, director of advisory services at IKON Commodities in Sydney.

U.S. Agriculture Secretary Brooke Rollins said on Monday the USDA is working with Congress to evaluate whether economic aid might be needed for farmers this autumn.