Wheat prices logged their biggest decline in a month Monday, sliding for a second day because of the higher crop estimates released last week by the U.S. government.

December wheat fell 28.75 cents, or 3.2 percent, to settle at $8.5775 a bushel. That’s the biggest drop since Oct. 12. The grain has gained about 30 percent since the start of the summer because of a jump in corn and soybean prices. Wheat can be used as a substitute for corn for some uses, such as cattle feed.