I have a pull type LP 606NT momatt so I have never had any drive wheel issues and can not speak to that. Unlike a lot of you guys, I do calibrate my drill when I need to figure out settings for new seeds or mixes. I have done it enough now that I can go by previous years' settings, or at least have a good starting point from notes of previous years. My brassica mix this year was Winfred Forage Brassica and PTT at 2#/acre and Rape, Crimson and Balsana clovers at 1#/acre each. Setting #25 gave me 5.13#/acre which I used in my summer cover crop mix, but I upped it to 6.85#/acre (Setting #35) for my July brassica planting.
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I know I can get by with including the forage radish with the smaller seeds in the small seed box, but I prefer to plant my radish a little deeper so I plant radish from the large box - and yes, it can be done very accurately...
Drive Gear 1 - Seed Cup 1 and Seed Rate Lever setting #8 gives my a little over 6#/acre of forage radish.
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4-5 weeks after planting the brassica/clover mix, I broadcast rye over the brassicas so I don't have bare dirt in the spring. This has worked out real well for me here.