You are right in that applying any fertilizer in strips or side dressed requires accurate row to row fertilizer division when we start getting down to applying just what is necessary for the plant. When we are just dumping N on a field at an angle non uniform row to row rates are largely hidden.

There are many fertilizer systems which will give you an accurate rate per acre but are far off in row to row distribution across the width of the applicator.

We have many anhydrous customers using the ANH3 high pressure system successfully. Here is their website.  For dry fertilizer, the Montag system gives a very uniform row to row distribution.

One caution about the 6000 and anhydrous is that the latest version seals well at much higher forward speeds than most knife based systems.  It is possible to outrun your ability to supply anhydrous from the tank and cavitate components.  At high tank flow rates you really need to look at the entire nh3 system:  1-1/4" lines rather than 1"  No bottleneck fittings to act as an orifice, at some high rates, tank pressures and weather conditions a bottom feed tank is a good idea.

In the applications I have seen there is really little difference in the sealing in the tire track. In certain wet soil conditions, tire compaction may be an issue as mentioned elsewhere in this thread but that is really true with any application system.

Important point is that just metering an accurate TOTAL flow rate does NOT mean you are getting accurate and uniform flow to each out let.  The ANH3 system uses a gage for each outlet so you can see they are equal.  ANH3 is also not as costly as some other high pressure systems.

jmho.

Jim at Dawn