Re: pull sprayer?
We have a Spray-Air 2282, suspended boom sprayer.
It works extremely well. We just started with it this year; first burnoff was .3L/acre of Factor 540 roundup, in 5 gal of water. By the time we got to doing canola, I was down to .25L/acre, in 3 gallons/acre of water.
We sprayed wheat with Frontline+Horizon+Tilt, at 4GPM and the guys from the elevator were amazed at how well the chemicals worked, especially Tilt which is supposed to be used with 15gpa of water. In flax, we used Select and did 80acres with a single case, which should treat 40 - 60. In Oats, one case of Frontline is for 40 acres, we sprayed 66 with it, and had complete control. You have to drive slower (5 - 8mph), but you can still cover a LOT of acres in a day.
The nozzles actually use wind from the fan, powered by the pto to turn a steady stream of product into a 8" wide fan. The nice thing is the flexibility; you can make big or small droplets depending on wind velocity (adjustable from cab), and also shut the fan off and use the sprayer as a dribble bar.