I did a small trial run in a field of canaryseed with buctril M.
The whole field was done @ 65% of normal rate (Normal is 20ac/jug).
One strip (on the right of this pic) was done at 100% of normal rate.
The lower-rate is 2.7GPA, the higher is 3.6GPA.
Video of spraying that same field: http://www.youtube.com/watch?v=uDpQwH6Pkqw