Cake fat is a good organic fertilizer that can be used, but it should be noted that the potassium content of the cake fertilizer is low, and the tomato needs a high amount of potassium, so it should be used in combination with potash fertilizer, especially in the middle and late stages of tomato growth. Pay attention to the top-dressing of potash fertilizer, you can flush with water when you water. With cake fat alone, the amount can not be many, it is best to use chicken manure or pig manure, so that organic matter is not too low.