Looking at getting a liquid sidedress bar.  It will be a 60' for 30" rows. I have somewhat wet sticky soils.  I'm thinking of going with coulter w/ injector nozzles and a closing wheel of some sort.  I would like to know the good/bad of this setup vs. a coulter/knife option.  Pros/cons of 23 units or 25 units.  Brand of bar? Looking at Fast, Farm King, or Unverferth.  Is a trailing hitch necessary? Any suggestions I would appreciate it.  I'm forced to leave sidedressing with NH3 since my sources have gotten out of NH3.