I'm about to embark on a new "thing." I need to kill off blackberries and queen anne's lace that are taking over my GF's hay field and part of the foresty-lawn area closer to the house. Probably total 8-9 acres. I've dribbled a little crossbow on some of it to make sure that's what I want to use. It's dead, very dead, satisfyingly dead.

So how do I know how much per acre to really use? How do I know how fast to travel with the tractor to apply that much?

How do I know where I've sprayed? Food coloring or something in the spray tank? Do I just paint the whole field orange, red, green, or whatever?

Any pointers for a noob would be appreciated.

Anyone who thinks there's two sides to everything hasn't met a M�bius strip.

Here be dragons ...