Many years ago, grew about 10 acres of buckwheat in a blue clay creek bottom because there was a gap in the nectar and pollen flow for our bees and the buckwheat bloomed in that gap. Made a very dark, strong, high alcohol content honey which I kind of miss. No till wasn’t a thing back then, or if it was we didn’t know about it. We grew turnips in the fall and winter as a companion crop but didn’t harvest more than a few turnips and none of the buckwheat. The unharvested turnips were the fertilizer for the buckwheat. In the late spring, we plowed, disced, and dragged the fields. Then planted the buckwheat with a broadcast spreader. Buckwheat grew about like weeds. Did that for about 10 years before developers ran us off the farm.
Zero experience harvesting. Wouldn’t know where to start on harvesting.
All that may be useless but that’s all I know about it.