When trying to repair your lawn and using fertilizers and seeds aren't working there is still another option; and that option is sod.
Sod is very simple if you know what to do.
There are only a few simple steps when putting sod in your lawn to replace a dead area of grass.
The first thing to do is to measure the area that you want to replace.
When going to buy the sod make sure to buy one quarter to one third more than needed just to be safe.
Now it is time to prepare the soil that you are going to replace.
First to make it easier on yourself make sure you cut the grass area in square patterns to match the sod.
Also remove about another inch of good grass around the dead area so that the sod will have a better chance of molding in with it.
If you do not do this there is a chance that there will be a section of dead grass in between the sod you have just put in and your lawn.
Remove about two to three inches of dirt in the area and then replace this with fresh topsoil and you can even mix in some types of fertilizers or peat moss to enrich the soil and make it better for the sod when it is planted.
Before laying down the sod make sure the dirt is well compacted and there is enough room for the sod to be placed even with the rest of the grass.
Now it's time to cut the sod and place it down.
A little tip is to cut the sod from the bottom where the dirt is rather than trying to cut through the grass layer.
This makes it easier and also allows you to cut straighter paths.
Another tip, even though obvious but very helpful is when cutting the sod is to use a sharp knife.
Something else you can do to help you cut the sod easier is to make a fold in the sod so the dirt is very tight, so when you start to cut it this fold will help to tare it apart.
Now lay the sod and also compact this down so it has a firm connection with the soil.
Now the most important part, watering.
Make sure to constantly water the area of sod that you have just replaced.