Here are a few links below, I also have other stuff on the hard drive of a now failed PC that is sitting here next to me. I intend to get certain files off of it yet, if I can. Hopefully I can post those at some future point in time.
Although I know I have scratched around enough to help the quail habitat on my place, I also do not consider myself an expert on the subject. Hopefully I am an "intermediate" level quail rancher. Nevertheless, here are some ideas, not necessarily in order of importance, that I think are key to the success that I have had.
But first, a quick story...approximately 5 years ago a neighbor of mine, who happens to have had first hand experience in this neighborhood going back over 40 years, told me that "back in the day", he could step off of the porch, load his gun and be back home in 45 minutes with a limit of quail more often than not. His "milk run" included a segment of what is now my farm.
From his history, I was able to learn about how the habitat on my farm was back then and the short version is that the tillable ground, now in the CRP program for about the 26th consecutive year BTW, was pastured to cattle and the "timber" mixed in the pasture was young. (From what I have gathered, the pasture was a key, key component as it provided a "floor" for the quail to run around on all year long.)
As I began to read more about quail habitat, I realized that my mostly brome "sea" of CRP was actually
preventing me from having more quail. The characteristics of brome are such that quail cannot walk over it and they cannot walk under it either. They are very small birds and their little feet have to be able to walk on something firm.
1. I have converted section of my brome CRP over to switchgrass. At this time I still only have less 3 standing acres of good switch, but more coming with recent plantings too. But that little bit of switch I think is where "my" quail spend 90% of their time around.
2. I planted milo this year and purposed to locate the small .5 to 1 acre milo plots right next to where I had switch. (I have read that quail habitat should be thought of in 15-30 chunks. You have to ALL of what a quail need in that space, so we don't want to spread out the various habitat needs over say 100 acres.)
2. My neighbor that I referenced earlier also raises bees on his place, which is immediately north of my place. As a part of his bee keeping activities he has planted yellow clover and he was amazed at how many quail were in his yellow clover field. In short, the "vines" grow overhead and create a canopy with almost 100% bare ground under those vines. Perfect! Overhead cover, bare ground AND food in the form of tiny seeds from the dried clover flowers. I plan on adding about an acre of yellow clover this year, 2 separate 1/2 acre fields worth.
3. I began planting EW a few years ago for screening food plots. Only I found that the pheasants and the quail were in the stuff all winter long. This past year I planted more, including a block of EW that was only 30' wide and 150' long. But, the quail are there every time I walk it. I will be planting more this year too.
4. Bare ground - either by fire, disking, spraying gly or some combination of all three, I always make sure to have 2-3 acres per year that start out as bare dirt early in the season, but then weeds spring up and I just let them go throughout the summer. This lassez faire approach provides bare ground, food in the form weed seeds, and overhead cover. Pheasants and quail both use these areas A LOT.
5. Edge feathering timber edges - I have done enough of this to see the benefit for birds as well as deer. Again, bare ground can be found below and good overhead cover can be found above.
6. Last years rye - I also leave 2-3 acres of last years rye just grow through the spring and into the summer. This provides great cover for nesting and I know deer will also fawn in these areas, along with game birds nesting/hiding.
Those are some of the keys. I look forward to doing even more habitat manipulation this year. I want to add some plum thickets in addition to what I have done already.
http://www.noble.org/ag/wildlife/quailmngt/
http://www.fwrc.msstate.edu/pubs/cp33_clay.pdf
http://www.fwrc.msstate.edu/pubs/nrcs.pdf
http://extension.missouri.edu/explorepdf/miscpubs/mp0902.pdf