Brian there are 3 types of sowing machines. The one you have is most likely for "Wheat, Barley, & Canola". There is also a sowing machine only for "Potatos" and another sowing machine that is for "Corn & Sugar Beets". Have a look through the store for "Amazone EDX 6000" or "Horsch Maestro 12SW". I have PC version of this game but I assume they are the same as yours.