posted 6 years ago
hau Cordell, first off, you don't need to kill anything already there since you want to create food plots for deer. (deer eat grasses)
Switchgrass will sprout and take over any area you plant the seeds for it in, the height of P. virgatum will shade out anything currently growing in that space or spaces which means those plants will die and become mulch until they decay into the soil.
There isn't really any need to till either, unless you really have the desire to spend extra money on fuel and the inherent costs of machinery up keep.
You might need to mow though so the current grass is short enough for the seedlings to establish.
Once the feed plot plants have taken hold, the lawn grasses will perish from being shaded out, the fact that they are there also allows for no erosion during that establishment period of the new plants.
So get out there and plant your seeds, if you need to, do a grass cutting first so your new seeds will be able to take off and get established. If the grasses are doing well, then you have a good microbiome going and there is absolutely no need to kill any of your current soil organisms.
Redhawk