Drive XLR8 works best when it has at least 24 hours to dry after application, wait at least 1 day before watering or applying a liquid fertilizer.
Your dilution rate depends on what you are specifically treating. Please see the Drive XLR8 product label for diltuion rates (see table starting on page 7).
Per the Drive XLR8 Herbicide label, it is only labeled for foxtail grass.
A better option would be Tenacity Herbicide. It is labeled for goosegrass, foxtail, and nimblewill. It is recommended to spot treat with Round Up in areas where the orchardgrass is growing.
The Drive XLR8 Label does not specifically mention Big Bluestem grass or Indian grass on the label whether it be as a target pest or as a tolerant species to the product. From the links below from the USDA NRCS it states that those grasses are tolerant to most broadleaf herbicides and should not be harmed if product directions are followed and applied accurately. That being said, you can follow the link below to the USDA Service Center Locator to speak with your local conservationist in your region on what works bests in your area and what products they may recommend.
Big Bluestem Grass
http://plants.usda.gov/factsheet/pdf/fs_ange.pdf
Indian grass
http://plants.usda.gov/factsheet/pdf/fs_sonu2.pdf
USDA Service Center Locator
Per the product label on Drive XLR8 you do not want to apply to exposed roots of trees or ornamentals or within the dripline of trees and other ornamentals species, This would cause potential damage to those trees.
Per the manufacturer BASF, when using Drive XLR8 Herbicide Crabgrass Killer they recommend using a methylated seed oil like DyneAmic Sufactant not a regular non-ionic surfactant.
We do have a post-emergent product that can be used in your lawn for clover. Depending on the type of fescue you have, this product can be used at the time of seeding. Drive XLR8 Herbicide is a very good product that is labeled for clover, as well as various other types of broadleaf weeds. It is safe for use in fescue as well. If you are overseeding with fine fescue, it is recommended that you use Drive XLR8 at least 7 days before seeding or 28 days after emergence of the new seed. If you are overseeding with tall fescue, Drive XLR8 can be used at any time. We do recommend using an MSO surfactant with this product as well. Please check the label with regards to this.
A pre-emergent can be used at the same time as a post emergent. Prodiamine 65 WDG is a very good option. It will prevent many broadleaf and grassy weeds from emerging. This should be done when the soil temperature reaches 55 degrees Fahrenheit. In southern states, individuals should be using this product in late February or early to mid March depending on the soil temperature.
We would also recommend checking out our Warm Season Lawn Schedule as well. This gives very good information on when to fertilize, use pre-emergents, etc. in your lawn.
Drive XLR8 Herbicide Crabgrass Killer could be mixed with Resolute 65 WDG as long as you follow the instructions on both product labels. However, if you are already seeing weeds it is too late for any pre-emergent to be effective.