The hydroseeding method: grass seed, water, fertilizer, and mulch are mixed and sprayed onto the specified areas.  

Hydroseeding is an efficient and cost effective way to seed grass.  Cheaper than sod, hydroseeding eliminates the worry of whether or not the sod will take.  Although hand seeding seems cheaper, hydroseeding uses the exact amount of seed needed per square foot while hand seeding makes it very easy to over seed.