Back in the "good old days", the burlap bags of grain on the combine and the screenings sacks from the cleaner mill, were tied using a special needle and a piece of small gauge twine. There was a certain way to tie the ear, then roll the bag while sinching it with the twine, then tie off the second ear and turn the needle upside down and snap it from the twine.

 Does anyone know where I can find any videos of this being done? Or where can I find the terminology used so I can locate an instruction website?

I'm not familar with tying ears in a grain sack.  We tied ears on the big wool sacks but not grain sacks.

You made me think of what Dad called a miller's knot.  If I had a piece of twine and a gunny sack of grain it may come back to my hands but I cannot see it in my head any longer.  I remember tucking the little finger under the twine as it went around and pulling the end through with the little finger for an easy release knot.

I did a googe search for "miller's knot and came up with this video:

http://www.youtube.com/watch?v=_IQpqzD2iyI

That may be the knot we tied.

In that video he mentions the Ashley Book of Knots.  I hope that will be of some help in finding what you are looking for.  Please keep us posted!


Edited to add a dead end link where someone asked about the "9 stitch method" of  sewing burlap bags:

http://www.ask.com/answers/232047221/is-there-an-article-about-hand-sewing-burlap-grain-sacks 

Any old spud growers in your area...
  Tied many a burlap bag of them. Begin by inserting millers string through the needle. leaving about three inches sticking through. You can get the string at most feed stores and cut to lenght needed. Start on one side with needle through the burlap.  about three inches from the end make a quick granny knot through the bag grab the three inches on that side to make and ear, knot that to the same knot or close to one you started with. wrap the needle through the burlap making sure your loops are close enough to hold what your bagging. continue till there are about three inches left. Fold it into and ear and tie with millers knot.. Lots easier to show than explain.
  can still get the needles at the local hardware, Nurseries should have them, come in various sizes, Used the 9 or7 inch on spud bags.
 Most grain baggers just use the single millers knot in center of bag for grain.

That is essentially how we tied ears closing wool bags.   Needle through the burlap 3-4" from corner, 2 half-hitches around to form the first ear.  Spiral/loop the string sewing the bag closed to the other ear, 2 half-hitches, needle through the burlap and then slip the needle off of the string or cut it off depending on type of needle used.  We used heavy string on wool bags instead of twine.  We sometimes used a curved needle, sometime a straight one.

I did edit my earlier repy to add a link to a question about the "9 stitch method" of sewing burlap bags of grain and sugar beets.  That was on ask.com I belief and there was no reply.  I am not familiar with that term.

  I think we are on the same track with the above descriptions. Here's one picture I found online of the way the top would look.

 I just remember with grain, there was a certain way to fold the ends to make it so the grain would not leak out now matter the position of the bag.

 Ben, very similar experiences here. At a very young age, it was just jaw dropping to watch. A lot of the reason I am asking, is I wish to learn how to do it and make a video of "how it was done", so that these little things can be shared the world over before they get lost forever.