Wheat futures fell in early trading at the Chicago Board of Trade on Friday after bigger-than-expected ending stocks and production data from the US Agriculture Department sparked a wave of profit taking, traders said. Wheat futures also weakened at the Kansas City Board of Trade and Minneapolis Grain Exchange. At 9:34 am CDT (1434 GMT), CBOT soft red winter wheat for September delivery was down 10 cents at $5.38-1/2 a bushel.