Buy the highest quality lawn fertilizer you can afford. The results will be far better than the cheap product and you will stand a lesser chance of burning your lawn.

The ingredients in the fertilizer will be printed on the bag and are listed as nitrogen, phosphorus and potassium:

Nitrogen is needed for healthy green growth and regulation of other nutrients.

Phosphorus helps proper roots and seeds develop and resist disease.

Potassium is also important in root development and disease resistance.
 

In almost every case you will be looking for a slow release fertilizer because a slow release feeds the lawn over a longer period of time and is far less likely to burn the lawn. The label on the package will state if product is a slow release or quick release.

Before purchasing your lawn fertilizer, read the instructions on the bag carefully or ask someone at the store for help. A neighbor that has had particularly green grass over the years will likely be more than happy to tell you what product he uses and how.

Remember, when you calculate your lawn’s dimensions to subtract the area of your home.

If you over apply the fertilizer you could well end up with a very embarrassing burned white lawn!
Err on the side of caution when calculating your application.

Dry, hot weather can make your lawn turn brown and go dormant if you are not following a strict watering routine. If your lawn has gone dormant make sure NOT to fertilize it when it is in this condition. If you haven't done so lately, (see the label) fertilize your lawn lightly when it begins to recover and turn green, after the rain returns. This will provide the nutrients it needs for a faster recovery.

Remove dog dishes; chew toys, kid’s toys, and leaves etc. from your lawn before you begin your application.

Use a high quality “broadcast” spreader with an accurate flow control setting (a drop spreader can have a higher chance of burning your lawn if you’re not experienced with the spreader).

Fill the spreader on the driveway so as not to accidentally drop excess fertilizer or a clump on the lawn – (guaranteed to leave a burn mark).

Apply fertilizer to dry grass, and read the package as to whether you are to water immediately after applying or let it sit dry for a day or so.

Apply half of the calculated and measured amount of fertilizer in one direction then apply the remaining fertilizer in the opposite direction so as to make a cross pattern. This will ensure even coverage and help prevent burning from too much overlap as well as help to cover any missed spots.

If you have any fertilizer left over you should store it in a cool dry place.

Wash and lubricate the spreader after you are finished using it.

Wash yourself after using fertilizer (lubrication should not be required).

Note: It is not recommended to use leftover lawn fertilizer on trees, shrubs, or plants, it was formulated for your lawn and you will surely need it again for your lawn.