You can develop your own card if you have the patience. The old cards may be off somewhat since fertilizer is now palletized unlike the old stuff. It could feed different with the new fertilizer. For either seed or fertilizer arrange to catch one or more of the tubes with a bucket or buckets. Start with the lowest setting and first pull the drill a short distance to get uniform feed. Then place the empty bucket and pull the unit through a know distance which can be measured after the fact. A longer distance and multiple tubes collected will yield more accurate results. Weigh the seed or fertilizer and calculate an application rate in pounds per acre and record along with the setting. Increase the setting and repeat until you exceed any application rate you ever expect to use. Plan on measuring 5 or 6 or more settings. Plot the points on a graph to interpolate between measurements. If you do not find a card and the math seems too involved, send me an email and I will try to walk you through. We never did depend on the cards or tables to completely establish drill settings. You still have to keep up with how much was actually applied on a know acreage and verify that the setting was correct. You can also do it by trial and error if you put a measuring wheel on the drill and determine the actual application rate for a given setting or you could also consider planting a know acreage and measuring as accurately as possible the pounds applied.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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