The first question to ask is what sort of rower are you? If you are simply a once every 24 hours athlete you do not need any special nutritional advice other than to eat a normal balanced diet. The trouble with that bland statement is what is balanced and what is normal? The gist of the answer to that is to have adequate amounts of protein, fat and carbohydrate and in the case of the last two mentioned the right types of food.
If, however, you are doing endurance training and training more than an hour a day at a high intensity then your carbohydrate and protein intake needs a more careful planning dependant on your fat content and your intensity of exercising.