Freind of mine just planted 300 acres of tillage radishes. used a kinze 24 row with rtk. came back and offset 15inch and planted Australia peas. Planted radishes last year and after I think two months of growing had a field day and used a backhoe to dig a trench in field and you could see that the root system went down like 24 inches. Its amazing how aggresive these plants grow, the tap root really grows into the ground also and they are a sponge for n. They stay green late into the season and in the spring after all the freezing there is nothing really left. Planting corn back in a strip till operation and with the root system that the radish has started really helps growth and with stored n. The radish helps keep n from leaching away. In a few weeks i can post some photos. The only draw back is the cost for the seed is expensive per say for a cover crop. What would have been nice was to have a splitter planter so we could cover the ground in one pass.