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The resistance is provided by the 100 percent projection level of an upward wave c from $3.54-1/2. This wave could extend a lot, as suggested by a confirmed inverted head-and-shoulders, which developed from the Aug. 29 low of $3.55-1/4. The pattern indicates a target around $3.95.
Support is at $3.75-1/4, a break below which could cause a limited loss to $3.73.
On the daily chart, corn broke a resistance at $3.76, the 38.2 percent retracement on the downtrend from $4.30 to $3.43. It could be heading towards $3.86.