To start with, get the soil test results based on the feedback you will get from the experts. Agricultural laboratories can be useful for testing the soil. Also, determine the size of your lawn in terms of square feet. You can use a yard calculator to help you calculate the size of your lawn. Know the type of fertilizer to apply depending on your lawn. It is recommendable to make three separate nitrogen applications. Find out about the annual recommended nitrogen fertilizer rates depending on your type of lawn. You will need to divide the annual recommendation for year 3 to know the amount to apply for each season. You will need to know the cool season lawn fertilizer rates to know the fertilizer to apply during the actively growing months. Knowing the nutrient analysis per fertilizer bag is also essential in determining how much fertilizer to apply.