The N rate treatments have ranged from nothing but starter N to as much as 286 lbs/ac
applied N. Most of the trials used sidedress liquid UAN simply to facilitate trial logistics.
Similar results would be expected from late pre-plant or sidedress anhydrous, but not
necessarily from early pre-plant anhydrous ammonia, early pre-plant liquid UAN, or fallapplied
anhydrous. Most of the trials were conducted on medium- and fine-textured soils: silt
loams, silty clay loams, and the like. Almost all of the trials have been field-scale; meaning
that the individual N rate “plots” are usually field length by some multiple of the combine
header width. Most of the trials have been harvested with the aid of GPS-enabled yield
monitors.