Chicago soybean prices on Wednesday slid from a 6-1/2-year high hit in the previous session as Argentine soy crushers signed a deal with oilseed workers to end a strike that had pushed up prices. 

Argentina's soy crushing companies signed a contract with the country's oilseed workers' unions late on Tuesday, ending a 20-day strike over wages that had paralysed exports from the world's top supplier of soymeal livestock feed.

The deal, following more than 10 hours of negotiations,includes a two-part 25% increase in salaries from January to August.

Increases for the rest of the year are to be determined by the inflation rate, Argentina's CIARA soy crushing chamber said in a statement.

The labour strike by the oilseed workers and grain inspectors had idled Argentina's ports, backing up more than 140 export ships.