I don't know about a lb/k as you asked DA (maybe you meant 2lbs?) We do spread it with our Zspray though. Our spring app goes down at 4lb/k with spreader setting around 6 3/8- 6/12. Our summer apps go down at 3lb/k w/ spreader around 5 1/2. Our winter app goes down around 2lb/k w/ spreader set between 4 1/2 - 5. I do open up the pattern a little more with the last app so perhaps that's how I get away with it. It does work though, and well.
edit: I'm talking amount of product, not lbs of nitrogen. sorry 'bout that.