It says you can mix it amine base herbicides.....
20-0-0 would be nitrogen only. Says it treats 15,000 sqft. An acre is 43,560 sqft.... so it isn't going to cover much area.
If you are spraying 2-4-D with it, unless it has a surfactant, or depending on what surfactant you use, I'd do it at least a day before a rain. Some chemicals can be sprayed only an hour or two before a rain and still stick..... but like I said, a day in advance is safe.
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