By Cassandra Garrison

MEXICO CITY, April 17 (Reuters) – Wheat prices in Chicago rose on Monday after Poland, Hungary and Slovakia banned grain and other food imports from Ukraine to protect their own sectors agriculture, raising new questions about Ukrainian exports.

* Corn was flat as colder weather and some snowfall in the Midwest threatened to delay plantings in the United States, while soybeans rose on weaker Argentinian exports.

* The most active wheat contract on the Chicago Stock Exchange rose 0.55% to $6.8625 a bushel at 3:28 p.m. GMT. Corn rose 0.11% to $6.67 a bushel and soybeans 0.73% to $15.115 a bushel.

* “Polish farmers are starting to protest against the drop in prices for grain and Ukrainian products, so it’s a bit risky,” said Don Roose, president of US Commodities.

* Poland and Hungary announced a ban on some imports from Ukraine on Saturday. Slovakia said on Monday it would do the same, while other central and eastern European countries were also considering taking action.

* Kyiv aims to reopen the transit of food and grain through Poland as a ‘first step’ to end import bans in talks that began in Warsaw on Monday as countries halted grain from of Ukraine to protect their agricultural markets.

* Additionally, on Monday, Ukraine said the Black Sea grain deal was at risk of “stalling” after Russia blocked inspections of participating vessels in Turkish waters.

* Argentinian soybean exports remain weak after a poor harvest, and grain inspectors have launched a 24-hour strike that is halting shipments at key river ports in the agricultural transport hub of Rosario.

* “Soybean prices were supported by tighter supplies and the belief that ending stocks could decline in future reports,” Roose said. (Reporting by Cassandra Garrison in Mexico City, Michael Hogan in Hamburg, additional reporting by Naveen Thukral in Singapore Editing in Spanish by Javier López de Lérida)

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