JOHANNESBURG, SOUTH AFRICA — A recent survey of traders conducted by Bloomberg indicates that South Africa, the biggest corn producer on the continent, may forecast a smaller crop of the grain in the 2010-11 season.

The government may say farmers will reap 11.5 million tonnes, down from the 12.82 million tonnes harvested in the prior season, according to the median estimate of 14 traders surveyed by Bloomberg. Forecasts ranged from 12.8 million tonnes to 11 million tonnes.