I would say the soil with 25% compost is better by far than fertilizers. Ferts do help yes I agree. The soil is the heart of the turf.First thing first: watering is the very first thing you should do! Water twice a day. It ís best to apply fertilizer before seeding or before laying sod, or after you plant your grass seed! I guess the rest is covered here!
If you have the opportunity to lay down some nice rich mix with compost, you will see some healthy turf that is enduring. Not just a couple weeks like fertilizers perk up the grass.
PICTURES PICTURES PICTURES!!!!
slomo