Commonly NWSG is planted on brome or fescue sod here in Iowa but when there are CRP sign ups then usually the seedings are done on crop lands. In those cases half the battle is already won because there is no sod to kill (one of the MOST important steps in preparing for NWSG plantings), soybean stubble is of course ideal because the soil surface is clean and seed can be broadcast or drilled.
Corn stubble is a close second because even though it looks "trashy" there is plenty of soil surface exposed and perennial sod grasses non-existent.
I'll be using a Truax no-till drill to dormant seed a NWSG mix in early December, although a drill is certainly not necessary. So I shredded part of the field and left the other part to share the difference if any at a later date. In the end other then for ease of running equipment there is usually no difference in the stand itself.
The shredded stalks look like this right now...
Something less often found when preparing for a NWSG planting is having to kill alfalfa or clover but in my case I had a 3 acre field of alfalfa that I had to kill. Alfalfa and clover are difficult to kill with glyphosate only and usually 2-4D is required.
I sprayed this three acre field with 6 quarts of 41% glyphosate and one gallon of 2-4D and it nuked everything!
I hated to have to destroy this beautiful alfalfa stand so i waited until early November 1st to spray it because the weather was still warm yet it 100% killed the field.
Preparation is the most important element in establishing a new stand of NWSG but as I have shared previously no tillage is necessary or advisable unless one has extremely rough field conditions. Not a single of square foot have I ever tilled for NWSG and yet they are all beautiful NWSG stands today.
In my case I'll be using Panoramic (Plateau) herbicide in the spring at 8 ounces per acre and this is one of the least expensive sources I know of...
Panoramic Herbicide source
On heavy soils Panoramic will cause minimal harm to switchgrass seedlings at 4 ounces per acre but at higher rates (which of course provide more effective weed control) this product can kill switch and many non-tolerant forbs. I had John Osenbaugh of Prairie Seed Farms keep any non-tolerant seeds separate and I will frost seed those the winter following, simple and easy method of getting around the "which herbicide" to use problem.
One can choose to simply clip weeds as needed and use no herbicides at all but it will take 2-3 years to establish the stand and the expense of mowing can exceed that of the herbicide which in this case will run around $16 an acre.
Dormant seeding in early December before heavy snows arrive is an extremely effective and low cost method of establishing native grasses and you can broadcast or drill seeds with equipment built for sowing fluffy seeds or in small fields simply scatter the seeds to the wind....easy as pie and a few years later it will be impossible to determine planting methods.
Drilling does have one advantage in that the seedlings can be "rowed" the following spring but remember the drill should not actually "plant" seeds as they should be no deeper then on top or 1/8" deep. A drill can be run across frozen soils and seeds simply placed on top and the no-till coulters will slice through stubble to insure seed/soil contact.
If you have a new CRP contract and CP-25 seeding to put in hopefully this information will give you some low cost yet effective establishment ideas....