(Updates byline, prices, analyst quotes, details on Ukraine production forecast, U.S. planting weather)

CHICAGO, April 16 (Reuters) -

Chicago Board of Trade soybean futures extended their fall on Tuesday as a strong dollar weighed down the market, analysts said.

Wheat futures stabilized as

Ukraine projected

a drop in grain production from 2023, while corn futures were nearly flat amid declining South American crop estimates.

CBOT soybeans futures for May delivery were down 13-1/4 cents at $11.45 a bushel by 12:30 CDT (1730 GMT). Corn fell 3/4 cent to $4.30-3/4 a bushel, and wheat fell 1-1/2 cents to $5.50-1/4 a bushel.

The dollar rose to its strongest since Nov. 2 against a basket of currencies, making U.S. farm goods costlier for buyers with other currencies and potentially damaging U.S. export demand.

U.S. soy and corn suppliers face stiff competition for global export sales from South America, while Russia has exported large amounts of wheat.

But crop consultant Michael Cordonnier said he cut his Argentine corn production forecast by 3 million metric tons to 50 million metric tons due to corn stunt disease.

In Brazil, the estimate for the

second corn harvest

in Parana state, the nation's second largest producer, will likely be cut in the next revision, said an official at crop agency Deral.

For wheat, Egypt's state grains buyer

said it bought

120,000 metric tons of Ukrainian supplies. Ukraine's farm ministry


its grain harvest is likely to fall to about 52 million metric tons from 58 million tons in 2023, mostly due to an expected smaller sowing area.

Traders are monitoring

U.S. plantings

of corn and soybeans. Wet weather in the east and cold weather further west in Minnesota and the Dakotas meant less planting this weekend than expected, said Jason Ward, market analyst with Northstar Commodity.

Ward said the trend in grain markets has been "lower highs and lower lows," and after a brief spike on Friday in anticipation of a confrontation between Iran and Israel, there was a "resumption of the trend." (Reporting Renee Hickman; Additional reporting by Peter Hobson and Sybille de La Hamaide; Editing by Rashmi Aich, Sohini Goswami and Richard Chang)