Mike,
I've come to the point where I find the amount of food produced to be unimportant. I've been trying to do QDM. The objective of the small wildlife openings is to provide kill plots for doe management and to increase the deer carrying capacity from a social perspective. Family doe groups tend to "claim" a small opening as anchor point for the group. More of these openings, distributed across the property, means more anchor points for family groups. Food is not always the limiting factor. Keep in mind that I'm on a pine farm. We do have good riparian buffers with oaks and a pipeline bisecting the property that is 60' 80 yards wide. So, in my case openings add diversity in what otherwise is a pine and oak monocultures.
There is also another type of opening that I described earlier that takes about 5 acres and cycles pines for pulp. These area do a fast cycle from early succession to pulp sized pines that are then clear cut to repeat the cycle.
All of these are part of a larger plan that includes bedding areas, controlled burns and rotating timber harvest. Some of our land will eventually be in savannah type habitat with a low stem count of large pines.
We use the large pipeline, divided into sections with bicolor lespedeza (warning, this is a non-native and can be invasive in some areas under some conditions), as our quality food plots. Here again, the amount of food produced is not important to me. What IS important is that here is sufficient Quality food in these plots to support deer during stress periods when the quality native food are scarce. Quality food, left in the field after the stress period is over, is not contributing to my deer.
So in our management plan, we want to feed our deer with quality native foods by habitat manipulation. It is native foods that deer eat most. Some guys think they are having success because deer are in their food plots all the time. It doesn't matter if deer are eating quality food plot food or quality native food, as long as they have quality food available they will do well. We see our food plots as supplementing our native quality foods during specific stress periods.
So, as far as the wildlife openings that start with clover and soft mast trees, I see them more native foods in the long run. Apples may not be technically native but they are certainly naturalized. The point being that as long as sun gets to the ground, nature will produce quality foods for a significant part of the year at a very low cost in time and money. Persimmons are native here, but the twist I put on them was to convert native male trees to female through bark grafting. I've purchased named tree scions as well as trading scions with others with an objective of having persimmons drop over an extended time period.
Thanks,
Jack