Fertilizer important for carrot is

The fertilizer important for carrots is K (Potassium).
For Carrot plants, it is best to choose a fertilizer low in nitrogen and high in phosphate and potassium. 0-10-10 or 5-15-15 fertilizer will work well for the Carrot plant. It is because potassium and phosphate promote root growth in carrots, and these nutrients will help their better growth.