CHICAGO, May 28 (Reuters) - Chicago Board of Trade soybean futures turned higher on Thursday under support from rising crude oil futures.

• Oil prices have been volatile in recent sessions as traders parse conflicting signals on the possibility of an end to the three-month Iran war and a potential re-opening of the Strait of Hormuz. Traffic through the maritime chokepoint remains at a small fraction of the pre-war level. O/R

• Chicago soybean futures often track oil prices, as the oilseed is used as a feedstock for biodiesel.

• On top of support from rising crude oil futures, the soybean complex was also buoyed by a brief strike in Argentina of oilseed workers.

• The strike, which ended hours after it began, had threatened to halt operations at crushing plants in the world's biggest exporter of processed soy products.

• The U.S. Federal Trade Commission said on Thursday it has been investigating increased fertilizer prices following a spike due to the war in Iran.

• Soaring prices for fertilizer and fuel due to the conflict have pinched farmers as they plant crops such as corn and grapple with a resurgent drought in parts of the U.S. Plains. Some growers are facing a fourth straight year of shrinking margins.

• CBOT July soybeans SN26 settled 9-1/4 cents higher at $11.94-1/2 per bushel.

• CBOT July soymeal SMN26 ended $3.50 higher to $334.10 per short ton.

• CBOT July soyoil BON26 ended 1.44 cents higher to 76.70 cents per pound.