Get your soil test done,I wouldn't kill all the CRP but maybe position a 1/2 acre plot into the crp to work with a stand or 2. Mow out that spot sprayit with gly-round up wait till its dead,till it in with lime or what ever ferts you need and let the new weeds start growing and then spray it again .then when they are dead you can braodcast your clove etc...and cultipack it to get good soil contact.The more time you take to prep that spot the better your plot will be..