u4411clb, Glad to provide you with planting and establishment advice. I prefer to broadcast on a well prepared and FIRM seedbed. Due to the seed being extremely small, I mix with fertilizer and use 3 point broadcast spreader. 2-3 Lbs/ac pls will be adequate. So if I was planting say 5 acres, I would mix 15 lbs seed with 50 lbs of fertilizer and try to set spreader to apply 1/2 the amount so I would go over the area twice to ensure good coverage. Hope this is making sense. I personally prefer not to cover due to the seed size, but be extremely careful to not cover deeply if you do choose to drag. I have had success drilling as well (reclaimed temporary terraces come to mind).
Mid-March to late-May seeding has been successful for me. What type areas and for what purpose are you planting Switchgrass? I am a livestock as well as a wildlife person, so it is very desirable. It tends to break the monotony of a pastureland landscape and provide valuable cover and edge effect for wildlife. I have literally stepped on white-tail deer bedded down in it. Good luck with your effort.
bellboer