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CBOT December wheat settled down 6 cents at $4.42 per bushel but stayed above Monday's two-week low of $4.39-1/2.
Much-needed showers in the US Midwest soft red winter wheat belt, along with recent rains in the Plains hard red wheat region, lent pressure.
K.C. December hard red winter wheat ended down 5-3/4 cents at $4.36 a bushel and MGEX December spring wheat fell 2-1/4 cents at $6.10.
Ahead of the US Department of Agriculture's weekly export sales report on Thursday, analysts expected the government to report wheat sales at 300,000 to 500,000 tonnes.