An up-and-down trading day ended with corn, soybeans and wheat all in positive territory Wednesday.

At the close, December corn was 3 1/4 cents higher at $6.01 1/4 per bushel, while January soybeans were 6 1/4 higher at $11.31 1/4 and December wheat was 1 1/4 higher at $5.95 3/4, according to Barchart.com.

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Wednesday's trade started off with a bang after officials with the U.S. Federal Reserve announced they were lowering a key bank fund swap interest rate. That sent all the grains to double-digit gains early, following other markets higher, like the Dow Jones Industrial Average that was around 400 points higher all day. But, traders took profits where they could in late-morning and early-afternoon trading, trimming some of the gains from earlier in the day.

On top of the DOW, crude oil traded higher and the U.S. Dollar index was lower Wednesday, both bullish to the grains. More fundamental to the grains, however, is a rumored sale of 2 cargoes of soybeans to China and a slight increase in farmer selling, though traders are wary that the latter factor may be only temporary.

• Read more: Exporters boost Gulf soybean basis  
• Also: Fed trims key bank rate