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Prices rebounded from negative territory after holding support near lows hit on Monday.
The most-active Chicago Board of Trade soft red winter wheat and K.C. hard red winter wheat contracts staked out two-year highs, but settled below session peaks.
Forecasts for more hot weather in the northern US Plains supported MGEX spring wheat contracts but profit-taking kept the gains in check.
Analysts were expecting a US Department of Agriculture report on Monday afternoon to show good to excellent ratings for spring wheat to fall 2 percentage points in the latest week.