Be interesting to put them in with a maize drill at those widthsNow for sometime compleatly different, we drill winters in 24" rows at 4/5" seed spacing. Yields have been as high as 7t+Ha, this year how ever the crop got hit by a very keen frost in early May, which knocked the stuffing out of it, splitting many of the stems and killing others, but still went on to yield 6.2t/ha.
Springs on the other hand I would never drill wider than 12".