Why 25"? Why not 24"? Why not 20".... or 22" ?
Why not the twin row system"
Why not stay with 30" rows , and look for hybrids that will throw more canopy, if that is your concern?
Honestly, access to harvest equipment is going to dictate corn row spacing for most farmers?
And right now 30" harvest equipment predominates.
Why not 25 inch corn spacing
