The 12MX has a variety of plates for different seeds. I have about six or eight different plates just for sweet corn. I also have plates for beans, peas, sorghum and squash to name a few. There is no "magic" single plate. You have to match the the seed to a plate. Seed spacing is determined by changing out gears. I have all the gears. There is a chart that lists seed spacing based upon the number of cells in the plate matched to a specific gear. Planting depth is set by adjusting the amount the "foot" extends below the skid plate. The 12MX allows you to apply starter fertilizer while you plant. The fertilizer is placed in the ground below and to the right of the seed.
I also have a Brinly planter, designed specifically for garden tractors. The Brinly was made by Cole. A note of caution on buying Cole planter plates. There are at least three different types of Cole planter plates. The 12MX uses a larger 8" diameter than the dual hopper or Brinly planters. The dual hoppers and Brinly's use a smaller OR/OL marked plate. There is also an older Cole plate style.
Bill
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