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Wheat prices finished up 2.4 percent Friday, while corn and soybean prices each rose nearly 1 percent.
Global wheat supplies are plentiful so far, but there has been speculation that freezing winter weather hurt crops in parts of Europe, which could cut into stockpiles.
Corn and soybeans supplies are already tight worldwide. Investors are speculating that inventories will shrink even more as details become available about potential crop damage from hot weather in Brazil and Argentina.
In other trading, oil, natural gas and platinum rose. Gold, silver and copper fell.