Triad Select Herbicide is used alone for the weeds listed on the label and does not mention tank mixing with any other product, only fertilizers, so we would not recommending doing so. It can be applied to listed established turf.
Triad Select Herbicide is not labeled to be used on anything edible. It would be recommend to discard anything that was sprayed.
Triad Select Herbicide is not labeled for oxalis. You may want to consider a product like Dismiss instead.
Surflan Pro Herbicide can be tank mixed with a post emergent herbicide like the Triad Select Herbicide as long as you follow directions completely from each product label for rates and follow the most restrictive instructions.