Soyabean futures on the Chicago Board of Trade fell to session lows on Tuesday as traders sold soyabeans and bought corn on inter-market spreads, brokers said. The positions were based on ideas that rains forecast for the US Midwest late this week would help soyabeans more than corn. As of 10:46 am CDT (1546 GMT), benchmark November soyabeans were down 8 cents at $13.54 per bushel after dipping to $13.50-3/4.