* President Donald Trump on Monday said he authorized a second round of payments from an aid package of up to $12 billion designed to help farmers stung by the US trade war with China.

WHEAT - Down 1 to 3 cents per bushel

* Wheat easing on profit-taking after rising 1 percent in the previous session. Declines limited by improving export prospects for US shipments amid rising Black Sea wheat prices.

* Russia's agriculture watchdog visited Iraq to discuss wheat supplies and possible deliveries of other grain crops.

* Ukraine grain traders union UZA expects wheat exports to reach 16 million tonnes in the 2018/19 season.

* CBOT March wheat last traded down 3 cents at $5.32-1/4 per bushel. K.C. March hard red winter wheat was down 3-1/2 cents at $5.18-1/2 a bushel and MGEX March spring wheat was down 1-3/4 cents at $5.83-1/2.

CORN - Up 1 cent to down 1 cent per bushel

* Corn mixed in range-bound trade as market awaits export news amid talk that China may start buying US corn.

* Ukraine grain traders union UZA expects corn exports to reach 27 million tonnes in the 2018/19 season.

* CBOT March corn last traded unchanged at $3.84 per bushel.

SOYBEANS - Up 2 to 5 cents per bushel

* Soybeans rise for a second straight day on expectations for more sales to China after the top importer last week bought its first US shipments in six months.

* The National Oilseed Processors Association reported a smaller-than-expected November soybean crush at 166.959 million bushels, below the average forecast for 168.444 million. Soyoil stocks fell to a one-year low.

* CBOT January soybeans last traded up 3-1/4 cents at $9.08 a bushel.