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The chart is just a start, sometimes not all that close. But you can calibrate it as close as you wish. Helps to have a sensitive scale. For mine, I jacked up one wheel, and put seed over one tube. I measured the circumference of that wheel, put a paper sack under the seed tube, turned the drill to plant and turned that wheel ten turns. Then I weighed the seed and from the distance and the drill spacing I figured out the rate per acre. Some would fill it with seed and in the barn, pull it over a canvas for a measured distance to increase the amount of seed to be sampled. Good sharp opening disks might shred the canvas too. That was quite a while ago (20 years) and then the manual from Deere was a whopping $2.85. They charge more today but almost surely have the manual to copy. Drill and implement manuals are not popular items at tractor shows and flea markets but sometimes the used manual dealers will have one. I saw a couple yesterday at Forest City, Iowa, but I don't remember seeing a DR drill. But then I was looking for a Case plow book. You won't want a row unit to back up because that tends to plug it, so you don't want to turn sharper than pivoting on the inside tire. Gerald J.
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