I have 41% Gly.
Is there a recommended gly ounces to gallon of water ratio for weed control?
Does it come in different concentrates?
Ed Spinazzola advocated spraying clover with weak gly in his book. Ed is a very experienced food plotter, but he's wrong on that one. But the date he wrote that was prior to the problem of gly resistance. I have done it years ago and it worked okay. It did knock back some weeds and the clover recovered, but have I created some long-term weed problems? Now, I'd either try clover safe herbicides, or spot spray before I used weak gly. You'll have less weed issues in the long run if nuke the plot and start over in September than spraying weak gly.
Something else to consider is the water you are using. Certain minerals/hardness in waterman pretty much render an herbicide useless unless the water is pre-treated with AMS (ammonium sulfate). There was an excellent thread about that exact thing on that defunct forum. You mention "grass and weeds". Are you 100% certain it's grass and not sedge? Clethodim is a very good and inexpensive grass herbicide but it won't work on sedge. 24db (for use on broadleaf weeds) is safe on clover but a lot of weeds just laugh at the stuff. And timing is another aspect. A lot of herbicides need to be applied when the weed is in an early growth stage and other weeds (like milkweed) should be sprayed later in the season.
Last thought...What are your broadleaf weeds in your clover? They ain't all bad. Some weeds are actually highly preferred forage in some areas. My deer go crazy over ragweed. They eat it before the eat beans. Know exactly what "weeds" you are dealing with before you decide how or if you want to fight them. I've waisted a lot of effort and money trying to create a perfectly clean food plot. Hairy Galinsoga is an example of a weed that shows up in my food plots in later summer. I used to get annoyed at the stuff until I realized how much my deer like it. They don't eat it early on, so I got the idea it was a problem. But later in the plant cycle, they eat it to the ground. There are some other weeds like that. BTW, Keystone Pest Solutions is a good place to buy 24db. You can go to their website and read the labels. And Wes Weaver knows his stuff and is very helpful. How old is that clover plot? Maybe it's time to start over? Maybe plant a nitrogen lover to suck up the N the clover has made.
I spray Clethodim in my clover plots to kill grass. I've tried Butyrac to kill non-clover broadleaf weeds, and in my experience, Butyrac is very weak. I didn't think it was very effective. If I'm trying to clean up a clover plot with a lot of broadleaf weeds, I just mow it, and then do it again a few weeks later. That seems to stunt the broadleaf weeds a fair bit and let the clover get back in front again.
So many variables in plotting that a standardized approach probably will not work for all, IMO.
Even those against gly with control of clovers have admitted it works with right conditions such as timing, concentration etc. I have stated the following on one thread in the past, and expect to get blasted again for doing so here.
It works for me. Here is what I do regarding clover. It is only used once per field before that field is totally turned under and planted to something else. I spray gly to extend the clover field's life for a year or two. This is after mowing has not kept control, and specialty herbicides are too expensive for me. Since most probably do not know how to calibrate their sprayers, or would not take the time, I have solid results with a 1.5% of 41% gly mix ratio to water with both a boom and boomless sprayer at normal ATC and/or tractor speeds. Normal mix ratio is 2%, and reading the label will confirm this even though ounces per acre are emphasized. In fact that is the ratio listed for spot spraying, which I understand places a high saturation rate on the plant so my ground speed makes sure I am getting adequate leaf coverage. (I only buy gly with surfactant added.)
Regarding gly resistant weeds, I doubt spraying a field every 4 years or so will cause this to any degree worth worrying about. Farmers have been spraying millions of acres for years and this is what is causing the weed resistant strains. It is common here for farmers to actually add some other herbicides to their gly now when prepping a field, and I believe some soybean seeds now are also gly and some weed killer resistance. If you have gly resistant plants it is probably from air born seeds being deposited on your land.
Up above someone said that not all weeds are bad. Last week I started a thread on just that, but no one responded. I do not worry about some weeds since deer are browsers and I notice they clip these plants right along with the clover. I start to try and manage the weeds and grass more when I notice a significant drop in use of that field.
More than my .02, but hopefully it will encourage others to experiment a little and learn. FYI, I have 60 acres of native grass I burn each year. I have 10-12' of bare ground around it as a barrier. I have to spray this each year before turning it, and I now add some weed killer to my gly because there are some weeds and the clover that appears that is not killed by the gly only.