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The most-active November soybean contract settled down 38-1/2 cents at $10.27-3/4 per bushel.
Blazing heat is expected this week in the US Midwest crop belt but rains in recent days have recharged soil moisture in many areas, potentially offsetting the impact of the hot spell.
The USDA late on Monday rated 71 percent of the US soybean crop as good to excellent, unchanged from a week earlier and among the highest ratings for mid-July in the last 20 years.
CBOT soymeal and soyoil futures followed soybeans lower.