could you please clarify. You state it is in a wooded lot, that you don't want anything to grow on. If it is wooded and you have acompany apply a pramitol product you will kill the existing vegetation trees and all.
Go to Lesco and talk with them about Sahara. Imazapyr is the a.i. Be sure you want bare ground. Also use non-ionic surfactant. For quicker results mix with glyphosate in which case you won't need added surfactant.
Yipes! If you are asking this question better stick with glyphosate and possibly a preemergent like oryazlin. No offence but bare ground and root absorbed herbicides can spell disaster in a landscape situation for trees and other veg in the proximity.
BTW Paraquat is a contact herbicide with no resitual, what was he thinking? Does not translocate, does not kill roots, would take many applications to deplete carbon bank of established brush, but hey it's a great aquatic herbicide.
First of all, using Sahara near or with-in the canopy of existing trees will kill them.
Sahara is mobile in the soil and requires a buffer strip to protect existing vegetation.
Provided you have access, triclropryl is a good brush control herbicide. Glylosphate based chemicals may not work as well due to limited uptake (same with other systemic herbicides)
Tordon controls cactus and other tap roots well, provided it is labelled for this application.
Remedy is labeled for mesquite control here in Texas, check it's availability/label in Alabama as it works quite well on stumps.