Posted 3/14/2019 14:05 (#7380287 - in reply to #7379942) Subject: RE: Coulters or knives?
My rig has a coulter in front and a knife in back, which is what I believe most people use?
The knife can blow out your seedbed in certain soils at certain moisture content.
We ameliorate that issue by going 2 inches or so inside the expected seed trench line (move rows to 36" on 80" centers for 40" rows. If at all concerned, we'll move them in farther to 34" or less.
I'm furrow irrigated, so an issue I consider critical is getting the fertilizer deeper than the seed. Anything on top of ground is wasted, as far as I'm concerned. But with pivots it's probably different. Phos is reputed to be immobile in soil, but not sure that applies to liquid sources?
Can't recommend a specific knife, but I'd definitely use one and move your rows in if you don't like the look of the seedbed behind it.