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* Corn bids were steady to firm at ethanol plants.
* The soybean basis was firm at river terminals, underpinned by a recent uptick in export demand.
* Soybean bids were steady to firm at interior elevators and processors.
* Farmer sales of both commodities were slow on Wednesday, a dealer in Council Bluffs, Iowa, said.
* Cash prices have stagnated well below grower targets.
* Private exporters reported the sale of 133,759 tonnes of soybeans for delivery to unknown destinations in the 2018/19 marketing year, the US Agriculture Department said on Wednesday.