HOCKENHEIM, Germany - Fernando Alonso has urged team mate Kimi Raikkonen to "improve".Spaniard Alonso has utterly dominated his fellow ex-champion at Ferrari since the Finn returned to the Maranello team for 2014.He argues Raikkonen's struggles are now hurting Ferrari. He Hockenheim fell behind Williams in the fight in the 2014 German F1 GP for third in the Constructors' standings.'WE HAVE TO IMPROVE'Alonso confirmed to the Spanish sports daily Marca after the German GP: "In the Constructors' championship we have lost a bit of ground to Williams."We have only been able to count on one car again and we have to improve on that."Stay with Wheels24 for the 2014 F1 season – fresh reports every day.