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Farmer sales eased after the return of forecasts for hot weather, seen by Thursday in the Midwest. That helped lift Chicago Board of Trade corn and soybeans contracts.
Extreme heat tends to hurt corn crops that are in the pollination phase, potentially reducing their yields. Scorching weather can also cut soybean yields.
Concerns that an Argentine truck strike might disrupt the country's corn and soybean exports provided added support to CBOT prices for both grains.
Limited farmer sales of corn and soybeans provided support to basis bids for both grains at river terminals.