The Bartels seed with a 4480 Harmon Airdrill. The u nit they are running now has 12 in. spacing. This replaced the previous machine which had 8 in. spacing. One of the main differences that Herb comments on is that the narrow spaced machine sometimes plugged in heavy residue. The opener that the Bartels use is Harmon's double shoot opener.
Fertilizer is knifed in with a bullet shaped eagle beak.
A paired row splitter places the seed to either side of and shallower than the fertilizer. This year Herb was able to get his air velocity down to the place where he is getting two distinct rows about 2.5 in. On this particular opener the splitter can be raised or lowered in comparison to the fertilizer beak opener. This allows fertilizer depth to be varied while keeping seed placement depth constant. Another boot has been placed between the knife opener and the seed splitter.