Soybeans dropped on Monday retreating from the strongest level in an eight-week period amid expectations that crops in the world's largest exporter of the commodity, Brazil, may be boosted by favourbale soil moisture and as rains in Argentina also help local crops. January soybeans futures lost 0.3% to $13.15 a bushel on the CBOT and traded at $13.1525 at 2:07 p.m. Singapore time.