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A John Deere logo sits on a farming machine at the Afgri Equipment Ltd. dealership for Deere & Co. agricultural equipment in Delmas, South Africa, on Tuesday, April 8, 2014. South African corn stockpiles probably will more than double in 2014-15 after the government predicted this season's harvest will be the biggest since 1981. Photographer: Dean Hutton/Bloomberg via Getty Images

A John Deere logo sits on a farming machine at the Afgri Equipment Ltd. dealership for Deere & Co. agricultural equipment in Delmas, South Africa, on Tuesday, April 8, 2014. South African corn stockpiles probably will more than double in 2014-15 after the government predicted this season's harvest will be the biggest since 1981. Photographer: Dean Hutton/Bloomberg via Getty Images