ICE Canadian canola futures dipped on Thursday for a second straight day, following weakness in soyabeans on improved weather for South American soya regions. Canola is following outside markets, due to limited canola export sales and cash selling by farmers, traders said. March canola lost $2.40 at $494.30 per tonne. May canola shed $3.10 to $500 per tonne. March-May canola spread traded 4,168 times. Chicago March soyabeans dipped on weak US exports and better South American weather.