what does a joiner on a molboard do

[brian kov]

can some one tell me about what job a joiner for a molboard plow actually does . we know what the coulter does ,it cuts a slit in the sod so as to let the molboard cut under and flip over cleanly but what about the joiner

[Dave (69 lo-boy)]

Jointer: A miniature moldboard plow attachment whose purpose is. to turn over a small furrow slice directly ahead of the main moldboard.
http://www.google.com/url?sa=U&start=4& ... 3D2&e=9797

[Bigdog]

It helps to turn the trash (vegetation) over so it will be covered by the dirt.

[George Willer]

I hope someone got a close-up picture of Scotty's plow in action. Under those conditions the coulter and especially the jointer were working as they should. When Scotty was making repeated passes there was no sod showing at all. The jointer REALLY helps.

Scotty spent enough time plowing with many different operators, so there must be pictures

[Don McCombs]

I left it big, so everyone could see the detail.

[Larry in IN]

Brian,
Back in the days when the Earth was young, leaving plowed fields 'clean' and trash-free was the ideal.
In the old sods especially, the grass would be vigorous enough that if you didn't get it buried it woud regrow and compete with the crop you wanted.
The jointer was to turn the part of the furrow that might not otherwise get buried. (the top left of the furrow slice in this case)
Today with minimal tillage and the effort against soil erosion , the cover of old crop residue on top is much more the norm.
We also have equipment that will work through that kind of cover today. When the Cub was introduced, that was definitely not the case.
Hope this makes sense.

[Jim Becker]

OK, I finally pulled out my plowing closeups from Cubfest. The first is Scotty with the combination jointer. I thought it was doing the best plowing that day. If you look closely, you can see the little bit of soil coming off the jointer. I don't remember whose the other one was, but I imagine the owner will speak up. This one had a plain colter with no jointer. I thought this plow was doing pretty well at the time. Note that it was not plowing as deep as Scotty, at least when I took this picture. Adjustment of colters etc. should be based partly on plowing depth.