Summary Box:
OJ DECLINE: Orange juice futures contracts fell to the lowest point in nearly three weeks as a stronger dollar made them less attractive for traders. The price has fallen about 5 percent since Friday after a government report forecast higher Florida crop production.
DOLLAR'S EFFECT: The dollar rose against other currencies amid ongoing concerns about Greece's debt problems.
MIXED GRAINS: Wheat fell while corn and soybeans closed higher. Analysts say soybeans were helped by a delayed harvest in Brazil and more demand from China.

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