Tarheelfan said:
I am looking to seed 4 acres of new lawn, I've been told that if I drill the seed in I wont need to straw? Is this correct, any suggestions appreciated
The answer to your question is a definate MAYBE.
Applying straw has less to do with how the seed is planted than several other factors. Primarily, straw cover is applied to (A) prevent/reduce soil erosion until there's enough cover to hold the soil in place, and (B) to help hold moisture in the soil by reducing direct sunlight from evaporating that moisture. Grass seed doesn't need, nor WANT to be planted very deep. Actually it only needs good soil contact and will germinate and grow just as well if seeded directly on the surface. The trick is to get that soil contact. Most soil conservation districts/county AG extention programs, when involved in government subsidized programs where grass is being seeded insist on using a cultipacker AFTER seeding, regardless of how the seed is applied. Some even require certain brands/models of seeders. The #1 choice seemes to be a Brillion Sure Stand or Brillion Landscapers seeder. They merely drop seed and roll it in with an integral cultipacker wheel.
The majority of "no till" grass seeders, slit seeders, turf renovators, and overseeders are intended to seed directly into established turf. They'll plant in fresh, bare soil, but are really out of their bailywick in that situation. They "dig" through existing turf to find dirt to get that direct soil contact for the seed they leave behind.
Most grain drills with a small seed attachment use the disc openers to stir the soil, then the small seeder drops grass seed on the fresh soil, then "cover chains" drag behind the drill to mix the seed with the top 1/4" or so of the soil. They don't actually "drill" the grass seed. Seed through the grain drilling portion of that drill, and most likely, seed will be far too deep for grass seed. A "good way" but not the "best way" to plant grass.
So, if you have fairly level ground, not subject to erosion problems (wind or water) , and forsee an ample supply of moisture in the months directly after seeding, straw mulching isn't a requirement regardless of how you seed.
Brillion Farm Equipment Online
http://www.brillionfarmeq.com/productpdf/26_SureStands.pdf