Chicago wheat futures fell to a two-month low on Friday as supply pressure from the US corn harvest and a recovery in Russian wheat exports weighed on prices, analysts said.

U.S. soybean processors crushed 196.3 million bushels in September, a 13-month low that came in below both the 197.9 million bushels of a year earlier and the 205 million bushels traders had expected, according to the National Oilseed Processors Association. Ethanol production averaged 1.065 million barrels a day, the highest in a month. Grain futures fell broadly, with soybean, corn and wheat front-month contracts all lower. Frost is forecast in Iowa, Wisconsin and Minnesota.

U.S. soybean harvesting was about 17% complete at the start of the week, matching the five-year average, but progress in top producer Iowa stood at just 3%. Corn harvest in Iowa reached 5%, about half the five-year average. Concerns that heavy rain tied to the remnants of Hurricane Polo could keep farmers out of fields pushed soybean and corn futures higher in overnight trading, according to USDA data.

Russia is moving to develop alternative grain export routes via Baltic terminals such as Ultramar, which can handle 37 million tons, and through the Murmansk port, which is expected to begin loading grain next month. The developments weighed on wheat futures overnight. Weekly U.S. export inspections for corn and soybeans rose from the prior week, while the spring wheat harvest is nearly complete.

Chicago Board of Trade soybean futures edged higher on Tuesday after weather reports and crop data stirred concerns about this year’s U.S. soybean harvest outlook. NOPA data showed July soybean crush rose 10.7% from a year earlier, pointing to firm demand, according to NOPA. Wheat futures settled down 8 cents, while corn eased slightly.