Corn is falling after U.S. farmers planted record amounts of corn last week, easing concern that earlier delays to planting would harm this year's crop.
July corn fell 9.5 cents, or 1.5 percent, to $6.40 a bushel.
The earlier in the season that corn is planted, the less susceptible the crop is to weather problems later in the year. Planting had been delayed by cold weather.
In other agricultural products trading, wheat fell, while soybeans advanced.
In metals trading, gold fell $6.50, or 0.5 percent, to $1,377.60 an ounce. The precious metal has declined for eight of the past nine days.
Silver, copper, platinum and palladium also fell.
The price of crude oil edged lower.