I need to drill some cool season grasses in my pasture which is currently mostly crabgrass. My question is how tall of grass will the drill work in ? Some is 4-5 inches tall but where the cows have fertilized its more like 10-12 inches. Should I just go ahead and bush hog it again then drill it or can I get by with just drilling it ? Is 20 pounds to the acre enough or should I go 25 pounds ? Also should I fertilize it this fall with mostly P and K then fertilize again in the spring with mostly Nitrogen ?