Hi, 

You can reference our soil testing page which has directions and a list of laboratories where you can send in a sample. 

Did you prepare the soil where you put the sod down? Was the sod watered regularly as needed. Initially that may have been needed daily. What time of year did you try the sod? 

If you'd like to send us a photo in the mean time while you wait for your soil test results, we can help with try to problem solve the issue. 

Emily